diff --git a/tatsu_api/client.py b/tatsu_api/client.py
index e39d151..c3bfe26 100644
--- a/tatsu_api/client.py
+++ b/tatsu_api/client.py
@@ -2,9 +2,10 @@
 
 import asyncio
 import itertools
-from types import TracebackType
 from typing import TYPE_CHECKING, Literal
 
+import aiohttp
+
 from .enums import ActionType
 from .http import HTTPClient
 from .models import (
@@ -24,9 +25,11 @@
 
 
 if TYPE_CHECKING:
+    from types import TracebackType
+
     from typing_extensions import Self
 else:
-    Self = object
+    TracebackType = Self = object
 
 
 __all__ = ("Client",)
@@ -39,10 +42,13 @@ class Client:
     ----------
     token: :class:`str`
         The Tatsu API key that will be used to authorize all requests to it.
+    session: :class:`aiohttp.ClientSession`, optional
+        A web client session to use for connecting to the API. If provided, the library is not responsible for closing
+        it. If not provided, the client will create one.
     """
 
-    def __init__(self, token: str) -> None:
-        self.http = HTTPClient(token)
+    def __init__(self, token: str, *, session: aiohttp.ClientSession | None = None) -> None:
+        self.http = HTTPClient(token, session=session)
 
     async def __aenter__(self) -> Self:
         return self
@@ -216,7 +222,7 @@ async def get_guild_rankings(
         rankings_list = [GUILD_RANKINGS_DECODER.decode(result) for result in results]
         truncated_rankings = tuple(
             ranking
-            for ranking in itertools.chain(*[item.rankings for item in rankings_list])
+            for ranking in itertools.chain.from_iterable(item.rankings for item in rankings_list)
             if ranking.rank in range(start + 1, end + 2)
         )
         return GuildRankings(str(guild_id), truncated_rankings)