diff --git a/doc/advanced/config-cheat-sheet.en-us.md b/doc/advanced/config-cheat-sheet.en-us.md
index c29151f6..0ed0d920 100644
--- a/doc/advanced/config-cheat-sheet.en-us.md
+++ b/doc/advanced/config-cheat-sheet.en-us.md
@@ -70,6 +70,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `ENABLE_PUSH_CREATE_USER`:  **false**: Allow users to push local repositories to Gitea and have them automatically created for a user.
 - `ENABLE_PUSH_CREATE_ORG`:  **false**: Allow users to push local repositories to Gitea and have them automatically created for an org.
 - `PREFIX_ARCHIVE_FILES`: **true**: Prefix archive files by placing them in a directory named after the repository.
+- `DISABLE_MIRRORS`: **false**: Disable the creation of **new** mirrors. Pre-existing mirrors remain valid.
 
 ### Repository - Pull Request (`repository.pull-request`)