diff --git a/ydb/aio/pool.py b/ydb/aio/pool.py
index fd4e8016..c637a7ca 100644
--- a/ydb/aio/pool.py
+++ b/ydb/aio/pool.py
@@ -1,11 +1,12 @@
 import asyncio
 import logging
 import random
+import typing
 
 from ydb import issues
 from ydb.pool import ConnectionsCache as _ConnectionsCache, IConnectionPool
 
-from .connection import Connection
+from .connection import Connection, EndpointKey
 
 from . import resolver
 
@@ -21,7 +22,7 @@ def __init__(self, use_all_nodes: bool = False):
 
         self._fast_fail_error = None
 
-    async def get(self, preferred_endpoint=None, fast_fail=False, wait_timeout=10):
+    async def get(self, preferred_endpoint: typing.Optional[EndpointKey] = None, fast_fail=False, wait_timeout=10):
 
         if fast_fail:
             await asyncio.wait_for(self._fast_fail_event.wait(), timeout=wait_timeout)
diff --git a/ydb/pool.py b/ydb/pool.py
index 1f33cf8a..1e75950e 100644
--- a/ydb/pool.py
+++ b/ydb/pool.py
@@ -5,11 +5,12 @@
 from concurrent import futures
 import collections
 import random
+import typing
 
 from . import connection as connection_impl, issues, resolver, _utilities, tracing
 from abc import abstractmethod
 
-from .connection import Connection
+from .connection import Connection, EndpointKey
 
 logger = logging.getLogger(__name__)
 
@@ -123,7 +124,7 @@ def subscribe(self):
             return subscription
 
     @tracing.with_trace()
-    def get(self, preferred_endpoint=None) -> Connection:
+    def get(self, preferred_endpoint: typing.Optional[EndpointKey] = None) -> Connection:
         with self.lock:
             if preferred_endpoint is not None and preferred_endpoint.node_id in self.connections_by_node_id:
                 return self.connections_by_node_id[preferred_endpoint.node_id]