diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst
index a800a0b8dee..bb93088b342 100644
--- a/Doc/library/contextlib.rst
+++ b/Doc/library/contextlib.rst
@@ -130,7 +130,9 @@ Functions and classes provided:
    either as decorators or with :keyword:`async with` statements::
 
      import time
+     from contextlib import asynccontextmanager
 
+     @asynccontextmanager
      async def timeit():
          now = time.monotonic()
          try: