diff --git a/modules/user/user.module b/modules/user/user.module
index d0e1027fe40..b35d102686a 100644
--- a/modules/user/user.module
+++ b/modules/user/user.module
@@ -721,7 +721,7 @@ function user_permission() {
     ),
     'administer users' => array(
       'title' => t('Administer users'),
-      'description' => t('Manage or block users, and manage their role assignments.'),
+      'description' => t('Manage or block users, and manage their role assignments. %warning', array('%warning' => t('Warning: Give to trusted roles only; this permission has security implications.'))),
     ),
     'access user profiles' => array(
       'title' => t('Access user profiles'),