bpo-37284: Add note to sys.implementation doc (GH-14328)
Add a brief note to indicate that any new required attributes must go through the PEP process.
https://bugs.python.org/issue37284
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index acd5442..6119bee 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -875,6 +875,10 @@
.. versionadded:: 3.3
+ .. note::
+
+ The addition of new required attributes must go through the normal PEP
+ process. See :pep:`421` for more information.
.. data:: int_info