Update nova policy management

Related: PROD-34318

Change-Id: Ifb4ba79dc2fc9cb53910898c39ccbc762f7ade4d
diff --git a/README.rst b/README.rst
index e5151f0..ce885a6 100644
--- a/README.rst
+++ b/README.rst
@@ -281,6 +281,20 @@
 .. note:: Barbican, Cinder, and placement url endpoints are discovering
    using service catalog.
 
+Change default service policy configuration:
+--------------------------------------------
+
+.. code-block:: yaml
+
+    nova:
+      controller:
+        policy:
+          'context_is_admin': 'role:admin or role:administrator'
+          'compute:create': 'rule:admin_or_owner'
+          # Add key without value to remove line from policy.json
+          'compute:create:attach_network':
+
+
 Compute nodes
 -------------