diff -upr drupal/includes/common.inc d7/includes/common.inc
--- drupal/includes/common.inc	2008-09-20 20:22:23.000000000 +0000
+++ d7/includes/common.inc	2008-09-30 16:52:47.000000000 +0000
@@ -2703,6 +2703,8 @@ function drupal_system_listing($mask, $d
 }
 
 /**
+ * Dispatch arrays for *_alter inplementations.
+ *
  * This dispatch function hands off structured Drupal arrays to type-specific
  * *_alter implementations. It ensures a consistent interface for all altering
  * operations.