diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index 2215443cf98..3f611062f1e 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -1,4 +1,4 @@
-<?php
+<?php // $Id$
 
 /**
  * @author Martin Dougiamas