diff -r b04560c3ce69 README.md
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+# This Is Not the Official Python Project Repository!
+
+### Though it will be, some time fairly soon
+
+You may have read announcements that Python developers have decided to move to git.
+That hasn't happened yet.
+
+## No Pull Requests, Please
+
+At present the move to Github is still being planned, and so pull requests
+to this repository will not be actioned. We try to inform people of this by responding to
+pull requests, but the time spent doing that would really be better spent developing the
+Python language!
+
+This site is currently a mirror of Python's official repository, which lives
+at https://hg.python.org/, updated daily as a service to those who are already using
+Github and find it a more convenient distribution channel.
+
+## Yes, Contributions Are Welcome
+
+The official Python source code repository is currently implemented on Mercurial.
+The Python Developers' Guide is at https://docs.python.org/devguide/, and it
+explains all you need you know to join the Python developers. If you are
+interested in contributring then we especially recommend that you read
+https://docs.python.org/devguide/#contributing.
+
+Thanks for taking time to visit the Python repository, and for yout interest in Python.
+
+-----------------------------------------------------------------------
+
+This file has been added to assist during the Mercurial-to-Github transition period,
+and will be replaced by the traditional README file when the transition is complete.