diff --git a/Lib/test/test_asyncio/utils.py b/Lib/test/test_asyncio/utils.py
index 1838915fe28261..c6e419da9f4295 100644
--- a/Lib/test/test_asyncio/utils.py
+++ b/Lib/test/test_asyncio/utils.py
@@ -558,6 +558,7 @@ def close_loop(loop):
                 pass
             else:
                 if isinstance(watcher, asyncio.ThreadedChildWatcher):
+                    # Wait for subprocess to finish, but not forever
                     for thread in list(watcher._threads.values()):
                         thread.join(timeout=support.SHORT_TIMEOUT)