Fix note about history

Author: guysoft

README.rst

@@ -8,7 +8,7 @@ FullPageOS
 A `Raspberry Pi <http://www.raspberrypi.org/>`_ distribution to display one webpage in full screen. It includes `Chromium <https://www.chromium.org/>`_ out of the box and the scripts necessary to load it at boot.
 This repository contains the source script to generate the distribution out of an existing `Raspbian <http://www.raspbian.org/>`_ distro image.
 
-FullPageOS is a fork of `OctoPi <https://github.com/guysoft/OctoPi>`_
+FullPageOS started as a fork from `OctoPi <https://github.com/guysoft/OctoPi>`_, but then joined the distros that use `CustomPiOS <https://github.com/guysoft/CustomPiOS>`_.
 
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