PEP 435: Add special note to reflect partial superceding by PyPA spec

pep-0425.txt

@@ -1,6 +1,5 @@
 PEP: 425
 Title: Compatibility Tags for Built Distributions
-Version: $Revision$
 Last-Modified: 07-Aug-2012
 Author: Daniel Holth <dholth@gmail.com>
 BDFL-Delegate: Nick Coghlan <ncoghlan@gmail.com>
@@ -14,6 +13,15 @@ Post-History: 08-Aug-2012, 18-Oct-2012, 15-Feb-2013
 Resolution: https://mail.python.org/pipermail/python-dev/2013-February/124116.html
 
 
+.. important::
+   This PEP is extended and partially superseded by the specification
+   `maintained on the PyPA Specifications section of packaging.python.org
+   <https://packaging.python.org/en/latest/specifications/binary-distribution-format/>`__.
+   See the `PyPA specification update process
+   <https://www.pypa.io/en/latest/specifications/#handling-fixes-and-other-minor-updates>`_
+   for how to propose editorial and content changes.
+
+
 Abstract
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