Explain the 'result' argument in asyncio.sleep
diff --git a/Doc/library/asyncio-task.rst b/Doc/library/asyncio-task.rst
index 43b5060..e4abacd 100644
--- a/Doc/library/asyncio-task.rst
+++ b/Doc/library/asyncio-task.rst
@@ -419,7 +419,8 @@
.. function:: sleep(delay, result=None, \*, loop=None)
Create a :ref:`coroutine object <coroutine>` that completes after a given
- time (in seconds).
+ time (in seconds). If *result* is provided, it is produced to the caller
+ when the coroutine completes.
.. function:: shield(arg, \*, loop=None)