diff --git a/descriptions/0/api.intercom.io.yaml b/descriptions/0/api.intercom.io.yaml
index af8126c..0315981 100644
--- a/descriptions/0/api.intercom.io.yaml
+++ b/descriptions/0/api.intercom.io.yaml
@@ -20091,6 +20091,11 @@ components:
           description: A list of an email address headers.
           items:
             "$ref": "#/components/schemas/email_address_header"
+        message_id:
+          type: string
+          nullable: true
+          description: The unique identifier for the email message as specified in the Message-ID header
+          example: "<CADKw7xrXzqSn8v3mP8K8Q8yZ6K8Q8yZ6@mail.gmail.com>"
     metadata:
           "$ref": "#/components/schemas/conversation_part_metadata"
     conversation_attribute_updated_by_workflow: