diff --git a/fastapi/concurrency.py b/fastapi/concurrency.py
index 76a5a2eb12..51d3cbadd0 100644
--- a/fastapi/concurrency.py
+++ b/fastapi/concurrency.py
@@ -1,3 +1,11 @@
+"""
+Concurrency utilities for FastAPI.
+
+Provides helpers for running context managers in thread pools to avoid
+blocking the async event loop, with re-exports of common Starlette
+concurrency primitives.
+"""
+
 from collections.abc import AsyncGenerator
 from contextlib import AbstractContextManager
 from contextlib import asynccontextmanager as asynccontextmanager