diff --git a/nonebot/plugin.py b/nonebot/plugin.py
index cefe7537..c6584615 100644
--- a/nonebot/plugin.py
+++ b/nonebot/plugin.py
@@ -143,7 +143,7 @@ def on_endswith(msg: str,
                           startswith(msg), permission, **kwargs)
 
 
-def on_command(cmd: Union[str, Tuple[str]],
+def on_command(cmd: Union[str, Tuple[str, ...]],
                rule: Optional[Union[Rule, RuleChecker]] = None,
                permission: Permission = Permission(),
                **kwargs) -> Type[Matcher]:
diff --git a/nonebot/rule.py b/nonebot/rule.py
index a846748f..34c1c7b4 100644
--- a/nonebot/rule.py
+++ b/nonebot/rule.py
@@ -110,7 +110,7 @@ def keyword(msg: str) -> Rule:
     return Rule(_keyword)
 
 
-def command(command: Tuple[str]) -> Rule:
+def command(command: Tuple[str, ...]) -> Rule:
     config = get_driver().config
     command_start = config.command_start
     command_sep = config.command_sep