Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.238.2.5
diff -u -r1.238.2.5 system.install
--- modules/system/system.install	17 Sep 2008 05:33:36 -0000	1.238.2.5
+++ modules/system/system.install	1 Jan 2009 15:15:16 -0000
@@ -1788,6 +1788,10 @@
         $item['router_path'] = $item['path'];
         $item['updated'] = FALSE;
       }
+      if ($item['description']) {
+        $item['options']['attributes']['title'] = $item['description'];
+      }      
+      
       // Save the link.
       menu_link_save($item);
       $_SESSION['menu_item_map'][$item['mid']] = array('mlid' => $item['mlid'], 'menu_name' => $item['menu_name']);