diff --git a/aiogram/dispatcher/dispatcher.py b/aiogram/dispatcher/dispatcher.py
index 9948c119..199db1d2 100644
--- a/aiogram/dispatcher/dispatcher.py
+++ b/aiogram/dispatcher/dispatcher.py
@@ -1031,7 +1031,7 @@ class Dispatcher(DataMixin, ContextInstanceMixin):
             return self.async_task(callback)
         return callback
 
-    def throttled(self, on_throttled: typing.Callable, *,
+    def throttled(self, on_throttled: typing.Optional[typing.Callable] = None,
                   key=None, rate=None,
                   user_id=None, chat_id=None):
         """
diff --git a/examples/throttling_example.py b/examples/throttling_example.py
index 3b2fe8cd..3c780974 100644
--- a/examples/throttling_example.py
+++ b/examples/throttling_example.py
@@ -61,7 +61,7 @@ async def say_hello(message: types.Message):
 
 
 @dp.message_handler(commands=['help'])
-@dp.throttled(None, rate=5)
+@dp.throttled(rate=5)
 # nothing will happen if the handler will be throttled
 async def help_handler(message: types.Message):
     await message.answer('Help!')