diff --git a/includes/session.inc b/includes/session.inc
index 86c7ebfaf625e46b569abeb380c19fbe79245dec..74ddb2c3f6159111cb6dcf2d620317a46d0e005c 100644
--- a/includes/session.inc
+++ b/includes/session.inc
@@ -149,7 +149,7 @@ function sess_gc($lifetime) {
  *
  * This function allows the caller to temporarily disable writing of session data,
  * should the request end while performing potentially dangerous operations, such as
- * manipulating the global $user object.
+ * manipulating the global $user object.  See http://drupal.org/node/218104 for usage
  *
  * @param $status
  *   Disables writing of session data when FALSE, (re-)enables writing when TRUE.