diff --git a/a_sync/primitives/queue.py b/a_sync/primitives/queue.py
index 7b710801..fff0b1c5 100644
--- a/a_sync/primitives/queue.py
+++ b/a_sync/primitives/queue.py
@@ -167,8 +167,12 @@ def _validate_args(i: int, can_return_less: bool) -> None:
         raise ValueError(f"`i` must be an integer greater than 1. You passed {i}")
 
 
+_Args = Tuple[Any]
+_Kwargs = Tuple[Tuple[str, Any]]
+_Key = Tuple[_Args, _Kwargs]
+
 class SmartFuture(asyncio.Future, Generic[T]):
-    def __init__(self, queue: "SmartProcessingQueue", key: "_Key", *, loop: Optional[asyncio.AbstractEventLoop] = None) -> None:
+    def __init__(self, queue: "SmartProcessingQueue", key: _Key, *, loop: Optional[asyncio.AbstractEventLoop] = None) -> None:
         super().__init__(loop=loop)
         self._queue = queue
         self._key = key
@@ -206,6 +210,7 @@ def _get(self, heappop=heapq.heappop):
         return heappop(self._queue)
 
 class PriorityProcessingQueue(_PriorityQueueMixin[T], ProcessingQueue[T, V]):
+    # NOTE: WIP
     async def put(self, priority: Any, *args: P.args, **kwargs: P.kwargs) -> "asyncio.Future[V]":
         self._ensure_workers()
         fut = asyncio.get_event_loop().create_future()
@@ -227,15 +232,14 @@ def _get(self, heapify=heapq.heapify, heappop=heapq.heappop):
         heapify(self._queue)
         # take the job with the most waiters
         return heappop(self._queue)
-    def _get_key(self, *args, **kwargs) -> "_Key":
+    def _get_key(self, *args, **kwargs) -> _Key:
         return (args, tuple((kwarg, kwargs[kwarg]) for kwarg in sorted(kwargs)))
-    def _create_future(self, key: "_Key") -> "asyncio.Future[V]":
+    def _create_future(self, key: _Key) -> "asyncio.Future[V]":
         return SmartFuture(self, key, loop=asyncio.get_event_loop())
 
 class VariablePriorityQueue(_VariablePriorityQueueMixin[T], asyncio.PriorityQueue):
     """A PriorityQueue subclass that allows priorities to be updated (or computed) on the fly"""
-
-_Key = Tuple[Tuple[Any], Tuple[Tuple[str, Any]]]
+    # NOTE: WIP
              
 class SmartProcessingQueue(_VariablePriorityQueueMixin[T], ProcessingQueue[Concatenate[T, P], V]):
     """A PriorityProcessingQueue subclass that will execute jobs with the most waiters first"""