diff --git a/lisp/whitespace.el b/lisp/whitespace.el
index e439f258a2b..c5b061dd585 100644
--- a/lisp/whitespace.el
+++ b/lisp/whitespace.el
@@ -5,6 +5,7 @@
 ;; Author: Rajesh Vaidheeswarran <rv@gnu.org>
 ;; Keywords: convenience
 
+;; $Id: $
 ;; This file is part of GNU Emacs.
 
 ;; GNU Emacs is free software; you can redistribute it and/or modify