diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 89706c4..e56f029 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -542,7 +542,7 @@ function user_access($string, $account = NULL) {
 /**
  * Checks for usernames blocked by user administration.
  *
- * @return boolean TRUE for blocked users, FALSE for active.
+ * @return boolean TRUE for blocked users, FALSE for active or name not found.
  */
 function user_is_blocked($name) {
   return db_select('users')