Add a note to README.rst about contributing to Zuul v3
Change-Id: Ie81a393900bb8fe057836ba6e13099c0f0e39e57
diff --git a/README.rst b/README.rst
index 2c98b68..90e00a5 100644
--- a/README.rst
+++ b/README.rst
@@ -6,6 +6,11 @@
Contributing
------------
+We are currently engaged in a significant development effort in
+preparation for the third major version of Zuul. We call this effort
+`Zuul v3`_ and it is described in this file in the `feature/zuulv3`
+branch of this repo.
+
To browse the latest code, see: https://git.openstack.org/cgit/openstack-infra/zuul/tree/
To clone the latest code, use `git clone git://git.openstack.org/openstack-infra/zuul`