diff --git a/update.php b/update.php
index eb8fe98..ffe724a 100644
--- a/update.php
+++ b/update.php
@@ -385,8 +385,8 @@ if (empty($op) && update_access_allowed()) {
   // Set up theme system for the maintenance page.
   drupal_maintenance_theme();
 
-  // Rebuild the registry to ensure that removed hooks in modules do not result
-  // in undefined function errors and that newly defined hooks are called.
+  // Rebuild the registry to account for classes that were moved or renamed
+  // in module updates.
   registry_rebuild();
 
   // Check the update requirements for Drupal.