diff --git a/asyncer/_main.py b/asyncer/_main.py
index 1fa778ea..c00788a0 100644
--- a/asyncer/_main.py
+++ b/asyncer/_main.py
@@ -2,9 +2,11 @@
 import sys
 from collections.abc import Awaitable, Callable, Coroutine
 from importlib import import_module
+from types import TracebackType
 from typing import (
     Any,
     Generic,
+    Literal,
     ParamSpec,
     TypeVar,
 )
@@ -169,6 +171,16 @@ async def __aenter__(self) -> "TaskGroup":  # pragma: nocover
         """Enter the task group context and allow starting new tasks."""
         return await super().__aenter__()  # type: ignore
 
+    # This is only for the return type annotation, but it won't really be called
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        exc_tb: TracebackType | None,
+    ) -> Literal[False]:  # pragma: nocover
+        """Exit the task group context once all tasks are completed."""
+        return await super().__aexit__(exc_type, exc_value, exc_tb)  # type: ignore
+
 
 def create_task_group() -> "TaskGroup":
     """