Add an additional key ? for describe-prefix-bindings

etc/ChangeLog

+2013-04-18  Leo Liu  <sdl.web@gmail.com>
+
+	* NEWS: Mention new key ? for describe-prefix-bindings.
+
 2013-04-15  Christopher Schmidt  <christopher@ch.ristopher.com>
 
 	* NEWS: Mention separation of package descriptor and name of

etc/NEWS

@@ -37,6 +37,8 @@ It is no longer needed, as the crt*.o files are no longer linked specially.
 
 * Changes in Emacs 24.4
 
+** Key ? also describes prefix bindings like C-h.
+
 +++
 ** `apropos-variable' is now `apropos-user-option'
 `apropos-user-option' shows all user options while `apropos-variable'

lisp/ChangeLog

+2013-04-18  Leo Liu  <sdl.web@gmail.com>
+
+	* bindings.el (help-event-list): Add ?\?.
+
 2013-04-18  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* subr.el (with-wrapper-hook): Declare obsolete.

lisp/bindings.el

@@ -675,7 +675,7 @@ language you are using."
 (garbage-collect)
 
 
-(setq help-event-list '(help f1))
+(setq help-event-list '(help f1 ?\?))
 
 (make-variable-buffer-local 'minor-mode-overriding-map-alist)