diff --git a/public/docs/ts/latest/guide/lifecycle-hooks.jade b/public/docs/ts/latest/guide/lifecycle-hooks.jade
index e565e7271d..2e1adda926 100644
--- a/public/docs/ts/latest/guide/lifecycle-hooks.jade
+++ b/public/docs/ts/latest/guide/lifecycle-hooks.jade
@@ -488,7 +488,7 @@ a#spy
 
   Go undercover with these two spy hooks to discover when an element is initialized or destroyed.
 
-  潜入这两个spy钩子来发现一个元素时什么时候被初始化或者销毁的。
+  潜入这两个spy钩子来发现一个元素是什么时候被初始化或者销毁的。
 
   This is the perfect infiltration job for a directive.
   The heroes will never know they're being watched.