From: Chong Yidong <cyd@stupidchicken.com>
Date: Sun, 1 Mar 2009 19:24:15 +0000 (+0000)
Subject: Add comment.
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Add comment.
---

diff --git a/lisp/abbrev.el b/lisp/abbrev.el
index 5b4ffe3ae8f..9092be584f4 100644
--- a/lisp/abbrev.el
+++ b/lisp/abbrev.el
@@ -522,6 +522,7 @@ the current abbrev table before abbrev lookup happens."
       (setplist newsym (symbol-plist sym)))
     (abbrev-table-put table :abbrev-table-modiff
                       (1+ (abbrev-table-get table :abbrev-table-modiff))))
+  ;; For backward compatibility, always return nil.
   nil)
 
 (defun define-abbrev (table name expansion &optional hook &rest props)