diff --git a/docs/guide/creating-a-matcher.md b/docs/guide/creating-a-matcher.md
index 1e5a4299..182885fe 100644
--- a/docs/guide/creating-a-matcher.md
+++ b/docs/guide/creating-a-matcher.md
@@ -115,16 +115,17 @@ rule 的出现使得 nonebot 对事件的响应可以非常自由，nonebot 内
 
 ```python
 from nonebot.rule import Rule
+from nonebot.typing import T_State
 
-async def async_checker(bot: Bot, event: Event, state: State) -> bool:
+async def async_checker(bot: Bot, event: Event, state: T_State) -> bool:
     return True
 
-def sync_checker(bot: Bot, event: Event, state: State) -> bool:
+def sync_checker(bot: Bot, event: Event, state: T_State) -> bool:
     return True
 
 def check(arg1, args2):
 
-    async def _checker(bot: Bot, event: Event, state: State) -> bool:
+    async def _checker(bot: Bot, event: Event, state: T_State) -> bool:
         return bool(arg1 + arg2)
 
     return Rule(_check)