PEP 12 & 1: Add a Change History section

peps/pep-0001.rst

@@ -581,7 +581,13 @@ Each PEP should have the following parts/sections:
 13. Footnotes -- A collection of footnotes cited in the PEP, and
     a place to list non-inline hyperlink targets.
 
-14. Copyright/license -- Each new PEP must be placed under a dual license of
+14. Change History -- A summary of major changes the PEP has undergone, based on discussions and feedback.
+    Think of this as a "changelog" or "release notes" for the PEP.  In general, whenever you update the
+    ``Post-History`` header for major changes, consider adding a dated entry in this section.  This isn't
+    mandatory, so it's left to the  PEP author's discretion, but such a section can be helpful for those
+    following along to understand the evolution of your PEP.  Here is :pep:`an example <694#change-history>`.
+
+15. Copyright/license -- Each new PEP must be placed under a dual license of
     public domain and CC0-1.0-Universal_ (see this PEP for an example).
 
 

peps/pep-0012/pep-NNNN.rst

@@ -88,6 +88,13 @@ Footnotes
 [A collection of footnotes cited in the PEP, and a place to list non-inline hyperlink targets.]
 
 
+Change History
+==============
+
+[A summary of major changes the PEP has undergone.  Add a dated entry here whenever you update the
+``Post-History`` header.]
+
+
 Copyright
 =========