diff --git a/Sources/docc/DocCDocumentation.docc/formatting-your-documentation-content.md b/Sources/docc/DocCDocumentation.docc/formatting-your-documentation-content.md
index 640a6ca3e..07d44ee0c 100644
--- a/Sources/docc/DocCDocumentation.docc/formatting-your-documentation-content.md
+++ b/Sources/docc/DocCDocumentation.docc/formatting-your-documentation-content.md
@@ -181,6 +181,7 @@ have one or more aliases.
 | shell       | console, shellsession                                  |
 | swift       |                                                        |
 | xml         | html, xhtml, rss, atom, xjb, xsd, xsl, plist, wsf, svg |
+| yaml        | yml                                                    |
 
 ### Add Bulleted, Numbered, and Term Lists