add comment

Author: blink1073

test/asynchronous/conftest.py

@@ -17,6 +17,7 @@ def event_loop_policy():
     # has issues with sharing sockets across loops (https://github.com/python/cpython/issues/122240)
     # We explicitly use a different loop implementation here to prevent that issue
     if sys.platform == "win32":
+        # Needed for Python 3.8.
         asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
         return asyncio.WindowsSelectorEventLoopPolicy()  # type: ignore[attr-defined]
 

test/conftest.py

@@ -15,6 +15,7 @@ def event_loop_policy():
     # has issues with sharing sockets across loops (https://github.com/python/cpython/issues/122240)
     # We explicitly use a different loop implementation here to prevent that issue
     if sys.platform == "win32":
+        # Needed for Python 3.8.
         asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
         return asyncio.WindowsSelectorEventLoopPolicy()  # type: ignore[attr-defined]