diff --git a/htdocs/user/class/user.class.php b/htdocs/user/class/user.class.php
index d917b53078a..976379ff5e5 100644
--- a/htdocs/user/class/user.class.php
+++ b/htdocs/user/class/user.class.php
@@ -2601,8 +2601,9 @@ class User extends CommonObject
 
 	/**
 	 * 	Return list of all child users id in herarchy (all sublevels).
+	 *  Note: Calling this function also reste full list of users into $this->users.
 	 *
-	 *	@return		array		      		  	Array of user id lower than user. This overwrite this->users.
+	 *	@return		array		      		  	Array of user id lower than user (all levels under user).
 	 *  @see get_children
 	 */
 	function getAllChildIds()