diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index eba439b46d7..4d08b2ee1ab 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2013-06-12  Xue Fuqiao  <xfq.free@gmail.com>
+
+	* ibuf-ext.el (ibuffer-mark-help-buffers): Doc fix.
+
 2013-06-12  Andreas Schwab  <schwab@suse.de>
 
 	* international/mule.el (auto-coding-alist): Use utf-8-emacs-unix
diff --git a/lisp/ibuf-ext.el b/lisp/ibuf-ext.el
index 146ba61a517..de36c6c86ce 100644
--- a/lisp/ibuf-ext.el
+++ b/lisp/ibuf-ext.el
@@ -1523,7 +1523,7 @@ You can then feed the file name(s) to other commands with \\[yank]."
 
 ;;;###autoload
 (defun ibuffer-mark-help-buffers ()
-  "Mark buffers like *Help*, *Apropos*, *Info*."
+  "Mark buffers whose major mode is in variable `ibuffer-help-buffer-modes'."
   (interactive)
   (ibuffer-mark-on-buffer
    #'(lambda (buf)