diff --git a/changelogs/fragments/75-env-vars-modules.yml b/changelogs/fragments/75-env-vars-modules.yml
new file mode 100644
index 00000000..529d9a80
--- /dev/null
+++ b/changelogs/fragments/75-env-vars-modules.yml
@@ -0,0 +1,2 @@
+minor_changes:
+  - "Allow modules to declare environment variables (https://github.com/ansible-community/antsibull-docs/pull/75)."
diff --git a/src/antsibull_docs/data/docsite/ansible-docsite/list_of_env_variables.rst.j2 b/src/antsibull_docs/data/docsite/ansible-docsite/list_of_env_variables.rst.j2
index fc93bce1..4a2e1f82 100644
--- a/src/antsibull_docs/data/docsite/ansible-docsite/list_of_env_variables.rst.j2
+++ b/src/antsibull_docs/data/docsite/ansible-docsite/list_of_env_variables.rst.j2
@@ -14,7 +14,7 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 {# TODO: use label `ansible_configuration_env_vars` once the ansible-core PR is merged #}
 
diff --git a/src/antsibull_docs/data/docsite/ansible-docsite/macros/parameters.rst.j2 b/src/antsibull_docs/data/docsite/ansible-docsite/macros/parameters.rst.j2
index 1f01edb4..156bea1c 100644
--- a/src/antsibull_docs/data/docsite/ansible-docsite/macros/parameters.rst.j2
+++ b/src/antsibull_docs/data/docsite/ansible-docsite/macros/parameters.rst.j2
@@ -110,12 +110,16 @@
       :ansible-option-default-bold:`Default:` :ansible-option-default:`@{ value['default'] | antsibull_to_json | rst_escape(escape_ending_whitespace=true) | indent(6, blank=true) }@`
 {%   endif %}
 {#   Configuration #}
-{%   if plugin_type != 'module' and plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
+{%   if plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
 
       .. rst-class:: ansible-option-line
 
       :ansible-option-configuration:`Configuration:`
 
+{%     if plugin_type == 'module' and value['env'] %}
+      The below environment variable{% if value['env'] | length > 1 %}s{% endif %} will be used on the host that executes this module.
+
+{%     endif %}
 {%     if value['ini'] %}
       - INI {% if value['ini'] | length == 1 %}entry{% else %}entries{% endif %}:
 {%       for ini in value['ini'] %}
@@ -143,7 +147,7 @@
 {%       endif %}
 @{       deprecates_rst(env['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for myvar in value['vars'] %}
+{%     for myvar in value['vars'] | default([]) %}
       - Variable: @{ myvar['name'] | rst_escape }@
 {%       if myvar['version_added'] is still_relevant(collection=myvar['version_added_collection'] or collection) %}
 
@@ -151,7 +155,7 @@
 {%       endif %}
 @{       deprecates_rst(myvar['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for kw in value['keyword'] %}
+{%     for kw in value['keyword'] | default([]) %}
       - Keyword: @{ kw['name'] | rst_escape }@
 {%       if kw['version_added'] is still_relevant(collection=kw['version_added_collection'] or collection) %}
 
@@ -159,7 +163,7 @@
 {%       endif %}
 @{       deprecates_rst(kw['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for mycli in value['cli'] %}
+{%     for mycli in value['cli'] | default([]) %}
       - CLI argument: @{ mycli['option'] | rst_escape }@
 {%       if mycli['version_added'] is still_relevant(collection=mycli['version_added_collection'] or collection) %}
 
@@ -239,8 +243,11 @@
       <p class="ansible-option-line"><strong class="ansible-option-default-bold">Default:</strong> <code class="ansible-value literal notranslate ansible-option-default">@{ value['default'] | antsibull_to_json | escape | indent(6, blank=true) }@</code></p>
 {%   endif %}
 {#   Configuration #}
-{%   if plugin_type != 'module' and plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
+{%   if plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
       <p class="ansible-option-line"><strong class="ansible-option-configuration">Configuration:</strong></p>
+{%     if plugin_type == 'module' and value['env'] %}
+      <p>The below environment variable{% if value['env'] | length > 1 %}s{% endif %} will be used on the host that executes this module.</p>
+{%     endif %}
       <ul class="simple">
 {%     if value['ini'] %}
       <li>
@@ -268,7 +275,7 @@
 @{       deprecates_html(env['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for myvar in value['vars'] %}
+{%     for myvar in value['vars'] | default([]) %}
       <li>
         <p>Variable: @{ myvar['name'] | escape }@</p>
 {%       if myvar['version_added'] is still_relevant(collection=myvar['version_added_collection'] or collection) %}
@@ -277,7 +284,7 @@
 @{       deprecates_html(myvar['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for kw in value['keyword'] %}
+{%     for kw in value['keyword'] | default([]) %}
       <li>
         <p>Keyword: @{ kw['name'] | escape }@</p>
 {%       if kw['version_added'] is still_relevant(collection=kw['version_added_collection'] or collection) %}
@@ -286,7 +293,7 @@
 @{       deprecates_html(kw['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for mycli in value['cli'] %}
+{%     for mycli in value['cli'] | default([]) %}
       <li>
         <p>CLI argument: @{ mycli['option'] | escape }@</p>
 {%       if mycli['version_added'] is still_relevant(collection=mycli['version_added_collection'] or collection) %}
diff --git a/src/antsibull_docs/schemas/docs/module.py b/src/antsibull_docs/schemas/docs/module.py
index b8dcf535..9134491c 100644
--- a/src/antsibull_docs/schemas/docs/module.py
+++ b/src/antsibull_docs/schemas/docs/module.py
@@ -9,10 +9,16 @@
 import pydantic as p
 
 from .base import BaseModel, DocSchema, OptionsSchema
-from .plugin import PluginExamplesSchema, PluginMetadataSchema, PluginReturnSchema
+from .plugin import (
+    OptionEnvSchema,
+    PluginExamplesSchema,
+    PluginMetadataSchema,
+    PluginReturnSchema,
+)
 
 
 class InnerModuleOptionsSchema(OptionsSchema):
+    env: list[OptionEnvSchema] = []
     suboptions: dict[str, "InnerModuleOptionsSchema"] = {}
 
     @p.root_validator(pre=True)
@@ -28,6 +34,7 @@ def allow_description_to_be_optional(cls, values):
 
 
 class ModuleOptionsSchema(OptionsSchema):
+    env: list[OptionEnvSchema] = []
     suboptions: dict[str, "InnerModuleOptionsSchema"] = {}
 
 
diff --git a/tests/functional/ansible-doc-cache-all-others.json b/tests/functional/ansible-doc-cache-all-others.json
index 7bd3fc44..8f332978 100644
--- a/tests/functional/ansible-doc-cache-all-others.json
+++ b/tests/functional/ansible-doc-cache-all-others.json
@@ -23111,6 +23111,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -23123,12 +23128,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-all.json b/tests/functional/ansible-doc-cache-all.json
index 1d66c580..3c16165f 100644
--- a/tests/functional/ansible-doc-cache-all.json
+++ b/tests/functional/ansible-doc-cache-all.json
@@ -23030,6 +23030,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -23042,12 +23047,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ansible.builtin-ns.col2-ns2.col.json b/tests/functional/ansible-doc-cache-ansible.builtin-ns.col2-ns2.col.json
index 60314327..0d7693c5 100644
--- a/tests/functional/ansible-doc-cache-ansible.builtin-ns.col2-ns2.col.json
+++ b/tests/functional/ansible-doc-cache-ansible.builtin-ns.col2-ns2.col.json
@@ -23030,6 +23030,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -23042,12 +23047,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ansible.builtin-ns2.col.json b/tests/functional/ansible-doc-cache-ansible.builtin-ns2.col.json
index 73d6a745..3d48c0a7 100644
--- a/tests/functional/ansible-doc-cache-ansible.builtin-ns2.col.json
+++ b/tests/functional/ansible-doc-cache-ansible.builtin-ns2.col.json
@@ -22655,6 +22655,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -22667,12 +22672,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ns.col1-ns.col2-ns2.col-ns2.flatcol.json b/tests/functional/ansible-doc-cache-ns.col1-ns.col2-ns2.col-ns2.flatcol.json
index e5ae147b..efa1b84e 100644
--- a/tests/functional/ansible-doc-cache-ns.col1-ns.col2-ns2.col-ns2.flatcol.json
+++ b/tests/functional/ansible-doc-cache-ns.col1-ns.col2-ns2.col-ns2.flatcol.json
@@ -1497,6 +1497,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -1509,12 +1514,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ns.col1-ns2.col-ns2.flatcol.json b/tests/functional/ansible-doc-cache-ns.col1-ns2.col-ns2.flatcol.json
index 92aafbac..db92bec6 100644
--- a/tests/functional/ansible-doc-cache-ns.col1-ns2.col-ns2.flatcol.json
+++ b/tests/functional/ansible-doc-cache-ns.col1-ns2.col-ns2.flatcol.json
@@ -1122,6 +1122,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -1134,12 +1139,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ns2.col.json b/tests/functional/ansible-doc-cache-ns2.col.json
index 4b0677ed..30092671 100644
--- a/tests/functional/ansible-doc-cache-ns2.col.json
+++ b/tests/functional/ansible-doc-cache-ns2.col.json
@@ -1122,6 +1122,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -1134,12 +1139,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/baseline-default/collections/environment_variables.rst b/tests/functional/baseline-default/collections/environment_variables.rst
index 7c10e9d7..41fdd87c 100644
--- a/tests/functional/baseline-default/collections/environment_variables.rst
+++ b/tests/functional/baseline-default/collections/environment_variables.rst
@@ -9,9 +9,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-default/collections/ns2/col/foo_module.rst b/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
index cae837d4..14d2eb31 100644
--- a/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
@@ -162,6 +162,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -185,7 +194,7 @@ Parameters
 
         :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -245,6 +254,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst b/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
index 7c10e9d7..41fdd87c 100644
--- a/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
+++ b/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
@@ -9,9 +9,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst b/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
index cae837d4..14d2eb31 100644
--- a/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
@@ -162,6 +162,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -185,7 +194,7 @@ Parameters
 
         :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -245,6 +254,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-no-indexes/collections/environment_variables.rst b/tests/functional/baseline-no-indexes/collections/environment_variables.rst
index 7c10e9d7..41fdd87c 100644
--- a/tests/functional/baseline-no-indexes/collections/environment_variables.rst
+++ b/tests/functional/baseline-no-indexes/collections/environment_variables.rst
@@ -9,9 +9,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst b/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
index cae837d4..14d2eb31 100644
--- a/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
@@ -162,6 +162,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -185,7 +194,7 @@ Parameters
 
         :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -245,6 +254,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-simplified-rst-squash-hierarchy/foo_module.rst b/tests/functional/baseline-simplified-rst-squash-hierarchy/foo_module.rst
index 47aa0a48..879271e1 100644
--- a/tests/functional/baseline-simplified-rst-squash-hierarchy/foo_module.rst
+++ b/tests/functional/baseline-simplified-rst-squash-hierarchy/foo_module.rst
@@ -95,7 +95,7 @@ Parameters
       <p style="font-size: small; margin-bottom: 0;">
         <span style="color: purple;">dictionary</span>
       </p>
-      <p><i style="font-size: small; color: darkgreen;">added in ns2.col 2.0.0</i></p>
+      <p><i style="font-size: small; color: darkgreen;">added in ns2.col 2.1.0</i></p>
     </td>
     <td valign="top">
       <p>Some recursive foo.</p>
diff --git a/tests/functional/baseline-simplified-rst/collections/ns2/col/foo_module.rst b/tests/functional/baseline-simplified-rst/collections/ns2/col/foo_module.rst
index 47aa0a48..879271e1 100644
--- a/tests/functional/baseline-simplified-rst/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-simplified-rst/collections/ns2/col/foo_module.rst
@@ -95,7 +95,7 @@ Parameters
       <p style="font-size: small; margin-bottom: 0;">
         <span style="color: purple;">dictionary</span>
       </p>
-      <p><i style="font-size: small; color: darkgreen;">added in ns2.col 2.0.0</i></p>
+      <p><i style="font-size: small; color: darkgreen;">added in ns2.col 2.1.0</i></p>
     </td>
     <td valign="top">
       <p>Some recursive foo.</p>
diff --git a/tests/functional/baseline-squash-hierarchy/environment_variables.rst b/tests/functional/baseline-squash-hierarchy/environment_variables.rst
index 7c10e9d7..41fdd87c 100644
--- a/tests/functional/baseline-squash-hierarchy/environment_variables.rst
+++ b/tests/functional/baseline-squash-hierarchy/environment_variables.rst
@@ -9,9 +9,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-squash-hierarchy/foo_module.rst b/tests/functional/baseline-squash-hierarchy/foo_module.rst
index cae837d4..14d2eb31 100644
--- a/tests/functional/baseline-squash-hierarchy/foo_module.rst
+++ b/tests/functional/baseline-squash-hierarchy/foo_module.rst
@@ -162,6 +162,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -185,7 +194,7 @@ Parameters
 
         :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -245,6 +254,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst b/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
index 7c10e9d7..41fdd87c 100644
--- a/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
@@ -9,9 +9,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ansplugin:`ns2.col.foo module <ns2.col.foo#module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
index 92d382ae..7e0b6869 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
@@ -119,6 +119,14 @@ Parameters
     </div></td>
     <td><div class="ansible-option-cell">
       <p>The foo source.</p>
+      <p class="ansible-option-line"><strong class="ansible-option-configuration">Configuration:</strong></p>
+      <p>The below environment variable will be used on the host that executes this module.</p>
+      <ul class="simple">
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_FOO</code></p>
+
+      </li>
+      </ul>
     </div></td>
   </tr>
   <tr class="row-even">
@@ -129,7 +137,7 @@ Parameters
       <p class="ansible-option-type-line">
         <span class="ansible-option-type">dictionary</span>
       </p>
-      <p><em class="ansible-option-versionadded">added in ns2.col 2.0.0</em></p>
+      <p><em class="ansible-option-versionadded">added in ns2.col 2.1.0</em></p>
     </div></td>
     <td><div class="ansible-option-cell">
       <p>Some recursive foo.</p>
@@ -149,6 +157,26 @@ Parameters
       <p>A sub foo.</p>
       <p>Whatever.</p>
       <p>Also required when <code class="ansible-option literal notranslate"><strong><a class="reference internal" href="#parameter-subfoo"><span class="std std-ref"><span class="pre">subfoo</span></span></a></strong></code> is specified when <code class="ansible-option-value literal notranslate"><a class="reference internal" href="#parameter-foo"><span class="std std-ref"><span class="pre">foo=bar</span></span></a></code> or <code class="ansible-value literal notranslate">baz</code>.</p>
+      <p class="ansible-option-line"><strong class="ansible-option-configuration">Configuration:</strong></p>
+      <p>The below environment variables will be used on the host that executes this module.</p>
+      <ul class="simple">
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_FOO</code></p>
+
+      </li>
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_BAR</code></p>
+        <p><em class="ansible-option-versionadded">added in ns2.col 2.2.0</em></p>
+
+      </li>
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_BAZ</code></p>
+  <p>Removed in: version 4.0.0</p>
+  <p>Why: Will be gone.</p>
+  <p>Alternative: use <code class='docutils literal notranslate'>ANSIBLE_BAR</code></p>
+
+      </li>
+      </ul>
     </div></td>
   </tr>
 
diff --git a/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py b/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
index d3884c6c..89329911 100644
--- a/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
+++ b/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
@@ -25,6 +25,8 @@
         description: The foo source.
         type: str
         required: true
+        env:
+          - name: ANSIBLE_FOO
     bar:
         description:
           - A bar.
@@ -36,7 +38,7 @@
           - baz
     subfoo:
         description: Some recursive foo.
-        version_added: 2.0.0
+        version_added: 2.1.0
         type: dict
         suboptions:
             foo:
@@ -46,6 +48,17 @@
                     - Also required when O(subfoo) is specified when O(foo=bar) or V(baz).
                 type: str
                 required: true
+                env:
+                  - name: ANSIBLE_FOO
+                  - name: ANSIBLE_BAR
+                    version_added: 2.2.0
+                  - name: ANSIBLE_BAZ
+                    deprecated:
+                        why: Will be gone.
+                        version: 4.0.0
+                        alternatives: use C(ANSIBLE_BAR)
+                        # TODO: remove once ansible-core supports env variable docs for modules
+                        removed_from_collection: ns2.col
 
 requirements:
     - Foo on remote.
diff --git a/tests/functional/schema/good_data/one_module_results.json b/tests/functional/schema/good_data/one_module_results.json
index 6427467b..a9f68b8d 100644
--- a/tests/functional/schema/good_data/one_module_results.json
+++ b/tests/functional/schema/good_data/one_module_results.json
@@ -214,6 +214,7 @@
                             "The groups to add the hostname to."
                         ],
                         "elements": "str",
+                        "env": [],
                         "required": false,
                         "suboptions": {},
                         "type": "list",
@@ -231,6 +232,7 @@
                             "The hostname/ip of the host to add to the inventory, can include a colon and a port number."
                         ],
                         "elements": "str",
+                        "env": [],
                         "required": true,
                         "suboptions": {},
                         "type": "str",