diff --git a/sharded_queue/__init__.py b/sharded_queue/__init__.py
index 0887856..1ffdc78 100644
--- a/sharded_queue/__init__.py
+++ b/sharded_queue/__init__.py
@@ -31,7 +31,7 @@ async def create(cls) -> Self:
     def request_cls(cls) -> type[T]:
         request_cls = list(get_type_hints(cls.handle).values())[0]
         if isinstance(request_cls, TypeVar):
-            raise NotImplementedError
+            raise NotImplementedError(cls)
         return request_cls
 
     @classmethod
@@ -45,7 +45,7 @@ async def start(self) -> None:
         pass
 
     async def handle(self, *requests: T) -> None:
-        raise NotImplementedError
+        raise NotImplementedError(self.__class__)
 
     async def stop(self) -> None:
         pass