Index: modules/system/system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.150
diff -u -p -r1.150 system.admin.inc
--- modules/system/system.admin.inc	25 May 2009 18:22:30 -0000	1.150
+++ modules/system/system.admin.inc	27 May 2009 00:01:11 -0000
@@ -1703,13 +1703,13 @@ function system_date_time_lookup() {
  * @see system_settings_form()
  */
 function system_site_maintenance_mode() {
-
+  global $base_url;
   $form['site_offline'] = array(
     '#type' => 'radios',
     '#title' => t('Site status'),
     '#default_value' => 0,
     '#options' => array(t('Online'), t('Offline')),
-    '#description' => t('When set to "Online", all visitors will be able to browse your site normally. When set to "Offline", only users with the "administer site configuration" permission will be able to access your site to perform maintenance; all other visitors will see the site offline message configured below. Authorized users can log in during "Offline" mode directly via the <a href="@user-login">user login</a> page.', array('@user-login' => url('user'))),
+    '#description' => t('When set to "Online", all visitors will be able to browse your site normally. When set to "Offline", only users with the "administer site configuration" permission will be able to access your site to perform maintenance tasks, such as visiting <a href="@update-php">update.php</a>; all other visitors will see the site offline message configured below. Authorized users can log in during "Offline" mode directly via the <a href="@user-login">user login</a> page.', array('@update-php' => $base_url . '/update.php', '@user-login' => url('user'))),
   );
 
   $form['site_offline_message'] = array(