PEP 820: Add "endorsements"

peps/pep-0820.rst

@@ -100,6 +100,33 @@ Limited forward compatibility
     versions.
 
 
+Endorsements
+------------
+
+This PEP is unusual in that it doesn't immediately help end users -- it needs
+to be in place well before it starts being helpful.
+In the words of a Cython maintainer,
+`Da Woods <https://discuss.python.org/t/105552/2>`__:
+
+  I suspect Cython wouldn’t immediately use it (at least for classes… obviously
+  if it goes into PEP 793 then we would for that).
+  Just because it’s mostly targeted at future improvements rather than an
+  immediate new feature. It looks usable though.
+
+Instead, support comes from core devs who'll need change the C API, and want
+do so in backwards-compatible ways:
+
+- `Mark Shannon <https://discuss.python.org/t/105552/4>`__:
+
+    This seems like a worthwhile improvement. Count me as a +1
+
+- `Victor Stinner <https://discuss.python.org/t/105552/19>`__:
+
+    I changed my mind and I’m now a supporter of PEP 820 :)
+    It took me a while but I now see the PEP 820 advantages: it enhances the
+    backward compatibility and the stable ABI.
+
+
 Example
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