diff --git a/zero-pinyin.el b/zero-pinyin.el
index 0b9ea925d6c72780000c47da9a75f9a933c27506..9e3d4674e8c8c7e7f632225a437ceb92dbc1bd40 100644
--- a/zero-pinyin.el
+++ b/zero-pinyin.el
@@ -19,6 +19,9 @@
 ;;   (add-to-list 'load-path "~/fromsource/zero")  ;; omit if install from melpa
 ;;   (require 'zero-pinyin)
 ;;   (zero-set-default-im 'pinyin)
+;;   ;; Now you may bind a key to zero-toggle to make it easy to
+;;   ;; switch on/off the input method.
+;;   (global-set-key (kbd "<f5>") 'zero-toggle)
 
 ;;; Code: