diff --git a/runatlantis.io/docs/server-configuration.md b/runatlantis.io/docs/server-configuration.md
index 961c60277c..ce2ff54ee2 100644
--- a/runatlantis.io/docs/server-configuration.md
+++ b/runatlantis.io/docs/server-configuration.md
@@ -226,6 +226,17 @@ Values are chosen in this order:
   ```
   Stops atlantis locking projects and or workspaces when running terraform
 
+ ### `--enable-regexp-cmd`
+  ```bash
+  atlantis server --enable-regexp-cmd
+  ```
+  Enable Atlantis to use regular expressions on plan/apply commands when \"-p\" flag is passed with it.
+
+  ::: warning SECURITY WARNING
+  It's not supposed to be used with `--disable-apply-all`.
+  The command `atlantis apply -p .*` will bypass the restriction and run apply on every projects
+  :::
+
 * ### `--gh-hostname`
   ```bash
   atlantis server --gh-hostname="my.github.enterprise.com"