diff --git a/code/LeftAndMain.php b/code/LeftAndMain.php
index b7c45e99..601e9a2b 100644
--- a/code/LeftAndMain.php
+++ b/code/LeftAndMain.php
@@ -37,6 +37,10 @@ class LeftAndMain extends Controller {
 	 */
 	static $tree_class = null;
 
+	/**
+	* The url used for the link in the Help tab in the backend
+	* Value can be overwritten if required in _config.php
+	*/
 	static $help_link = 'http://userhelp.silverstripe.org';
 
 	static $allowed_actions = array(