(iswitchb-max-to-show): Update documentation and :type information.

diff --git a/lisp/iswitchb.el b/lisp/iswitchb.el
index 4f560820b09dafa63b2b9d4bdcab7eb3626ac649..5ea1f856aca34edd072d34b1d584f8be60986f95 100644 (file)
--- a/lisp/iswitchb.el
+++ b/lisp/iswitchb.el
@@ -300,9 +300,11 @@ example functions that filter buffernames."
 
 (defcustom iswitchb-max-to-show nil
   "*If non-nil, limit the number of names shown in the minibuffer.
-This can greatly speed up iswitchb if you have a multitude of
-buffers open."
-  :type 'integer
+If this value is N, and N is greater than the number of matching
+buffers, the first N/2 and the last N/2 matching buffers are
+shown.  This can greatly speed up iswitchb if you have a
+multitude of buffers open."
+  :type '(choice (const nil) integer)
   :group 'iswitchb)
 
 (defcustom iswitchb-cannot-complete-hook 'iswitchb-completion-help