diff --git a/Lib/selectors.py b/Lib/selectors.py
index 6d569c30adf..d8769e35411 100644
--- a/Lib/selectors.py
+++ b/Lib/selectors.py
@@ -43,9 +43,18 @@ def _fileobj_to_fd(fileobj):
 
 
 SelectorKey = namedtuple('SelectorKey', ['fileobj', 'fd', 'events', 'data'])
-"""Object used to associate a file object to its backing file descriptor,
-selected event mask and attached data."""
 
+SelectorKey.__doc__ = """SelectorKey(fileobj, fd, events, data)
+
+    Object used to associate a file object to its backing
+    file descriptor, selected event mask, and attached data.
+"""
+if sys.version_info >= (3, 5):
+    SelectorKey.fileobj.__doc__ = 'File object registered.'
+    SelectorKey.fd.__doc__ = 'Underlying file descriptor.'
+    SelectorKey.events.__doc__ = 'Events that must be waited for on this file object.'
+    SelectorKey.data.__doc__ = ('''Optional opaque data associated to this file object.
+    For example, this could be used to store a per-client session ID.''')
 
 class _SelectorMapping(Mapping):
     """Mapping of file objects to selector keys."""
diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index c111e2fe1e5..e90f17dda63 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -427,9 +427,10 @@ class SubprocessMixin:
 
             create = asyncio.create_subprocess_exec(sys.executable, '-c',
                                                     'pass', loop=self.loop)
-            with support.check_no_resource_warning(self):
+            with warnings.catch_warnings(record=True) as warns:
                 with self.assertRaises(exc):
                     self.loop.run_until_complete(create)
+                self.assertEqual(warns, [])
 
 
 if sys.platform != 'win32':