Index: documentation/content/en/articles/committers-guide/_index.adoc
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--- documentation/content/en/articles/committers-guide/_index.adoc
+++ documentation/content/en/articles/committers-guide/_index.adoc
@@ -2563,6 +2563,10 @@
 It should include the entire URL to the pull request, as these often act as code reviews for the code.
 For example: `https://github.com/freebsd/freebsd-src/pull/745`
 
+|`Co-authored-by:`
+|The name and email address of an additional author of the commit.
+GitHub has a detailed description of the Co-authored-by trailer at https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors.
+
 |`Signed-off-by:`
 |ID certifies compliance with https://developercertificate.org/