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diff --git a/docker/services/README.rst b/docker/services/README.rst
index edaa5ee9..c054e8c0 100644
--- a/docker/services/README.rst
+++ b/docker/services/README.rst
@@ -76,6 +76,13 @@ are re-asserted when applying latter ones.
    'docker_image' above but some containers share a common set of
    config files which are generated in a common base container.
 
+ * docker_puppet_tasks: This section provides data to drive the
+   docker-puppet.py tool directly. The task is executed only once
+   within the cluster (not on each node) and is useful for several
+   puppet snippets we require for initialization of things like
+   keystone endpoints, database users, etc. See docker-puppet.py
+   for formatting.
+
 Docker steps
 ------------
 Similar to baremetal docker containers are brought up in a stepwise manner.