Document fast-track deprecation policy
@@ -38,11 +38,17 @@ Deprecation Policy
Any change to pip that removes or significantly alters user-visible behavior
that is described in the pip documentation will be deprecated for a minimum of
-6 months before the change occurs. Deprecation will take the form of a warning
+6 months before the change occurs.
+
+Certain changes may be fast tracked and have a deprecation period of 3 months.
+This requires at least two members of the pip team to be in favor of doing so,
+and no pip maintainers opposing.
+
+Deprecation will take the form of a warning
being issued by pip when the feature is used. Longer deprecation periods, or
deprecation warnings for behavior changes that would not normally be covered by
this policy, are also possible depending on circumstances, but this is at the
-discretion of the pip developers.
+discretion of the pip maintainers.
Note that the documentation is the sole reference for what counts as agreed
behavior. If something isn't explicitly mentioned in the documentation, it can
