diff --git a/etc/ChangeLog b/etc/ChangeLog
index 2b7534dc1e73d116ad60765670c8d66e87304b05..0dd27a1c0c08d8e1d494e2424d0636d8cc7190fb 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,7 @@
+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
diff --git a/etc/NEWS b/etc/NEWS
index 99d750b9742f1885f3fbe29077d0dc6da185d3ac..8f64aa6e7eeb58ef397d68eb8ded1eec89aa6482 100644
--- a/etc/NEWS
+++ b/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'
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 6d8f1ee49dcd1165fb9673d58b963caafc80def4..2e4050bec8c69b4b4106bdb146d77c426ec6e5da 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+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.
diff --git a/lisp/bindings.el b/lisp/bindings.el
index 5c95bcd0baafff5e0a01e16236c349e7eb170cb6..fe0eabb77af3eafa64f789c3e7d816908d781501 100644
--- a/lisp/bindings.el
+++ b/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)