diff --git a/docs/zh_cn/tutorials/hook.md b/docs/zh_cn/tutorials/hook.md
index e3b3d4989a..d74c426d6a 100644
--- a/docs/zh_cn/tutorials/hook.md
+++ b/docs/zh_cn/tutorials/hook.md
@@ -258,7 +258,7 @@ custom_hooks = dict(
 )
 ```
 
-也可以在定义类是给定优先级
+也可以在定义类时给定优先级
 
 ```python
 @HOOKS.register_module()