Index: wp-admin/menu.php
===================================================================
--- wp-admin/menu.php	(revision 18320)
+++ wp-admin/menu.php	(working copy)
@@ -51,7 +51,7 @@
 			$wordpress_update_count = 1;
 	}
 
-	$total_update_count = $plugin_update_count + $theme_update_count + $wordpress_update_count;
+	$total_update_count = apply_filters('update_count', $plugin_update_count + $theme_update_count + $wordpress_update_count);
 	$update_title = array();
 	if ( $wordpress_update_count )
 		$update_title[] = sprintf(__('%d WordPress Update'), $wordpress_update_count);