2 files changed, 5 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 0d9dde58572..9a7bd98e09b 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2002-01-20  Pavel Jan,Bm(Bk  <Pavel@Janik.cz>
+
+        * scroll-bar.el (scroll-bar-mode): Make argument optional.
+
 2002-01-20  Jason Rumney  <jasonr@gnu.org>
 
         * w32-vars.el: New file.
diff --git a/lisp/scroll-bar.el b/lisp/scroll-bar.el
index 493a271cf23..d08c5c63acd 100644
--- a/lisp/scroll-bar.el
+++ b/lisp/scroll-bar.el
@@ -105,7 +105,7 @@ Setting the variable with a customization buffer also takes effect."
 ;; If it is set again, that is for real.
 (setq scroll-bar-mode-explicit t)
 
-(defun scroll-bar-mode (flag)
+(defun scroll-bar-mode (&optional flag)
   "Toggle display of vertical scroll bars on all frames.
 This command applies to all frames that exist and frames to be
 created in the future.