diff --git a/nonebot/plugin.py b/nonebot/plugin.py
index 82439f1a..94628b29 100644
--- a/nonebot/plugin.py
+++ b/nonebot/plugin.py
@@ -27,7 +27,8 @@ class Plugin(object):
     matcher: Set[Type[Matcher]]
 
 
-def on(rule: Optional[Union[Rule, RuleChecker]] = None,
+def on(type: str = "",
+       rule: Optional[Union[Rule, RuleChecker]] = None,
        permission: Optional[Permission] = None,
        *,
        handlers: Optional[List[Handler]] = None,
@@ -35,7 +36,7 @@ def on(rule: Optional[Union[Rule, RuleChecker]] = None,
        priority: int = 1,
        block: bool = False,
        state: Optional[dict] = None) -> Type[Matcher]:
-    matcher = Matcher.new("",
+    matcher = Matcher.new(type,
                           Rule() & rule,
                           permission or Permission(),
                           temp=temp,
diff --git a/nonebot/plugin.pyi b/nonebot/plugin.pyi
index f75a2ee4..ccb8aed4 100644
--- a/nonebot/plugin.pyi
+++ b/nonebot/plugin.pyi
@@ -18,7 +18,8 @@ class Plugin(object):
     matcher: Set[Type[Matcher]]
 
 
-def on(rule: Optional[Union[Rule, RuleChecker]] = ...,
+def on(type: str = ...,
+       rule: Optional[Union[Rule, RuleChecker]] = ...,
        permission: Optional[Permission] = ...,
        *,
        handlers: Optional[List[Handler]] = ...,