diff --git a/HACKING.rst b/HACKING.rst
index 9868e39..3379292 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -43,6 +43,23 @@
 
 .. _extension test class: https://github.com/openstack/patrole/tree/master/patrole_tempest_plugin/tests/api/network#neutron-extension-rbac-tests
 
+Supported OpenStack Components
+------------------------------
+
+Patrole only offers **in-tree** integration testing coverage for the following
+components:
+
+* Cinder
+* Glance
+* Keystone
+* Neutron
+* Nova
+
+Patrole currently has no stable library, so reliance upon Patrole's framework
+for external RBAC testing should be done with caution. Nonetheless, even when
+Patrole has a stable library, it will only offer in-tree RBAC testing for
+the components listed above.
+
 Role Overriding
 ---------------
 
diff --git a/README.rst b/README.rst
index 5331445..713756a 100644
--- a/README.rst
+++ b/README.rst
@@ -18,9 +18,6 @@
 allowing deployments to verify that only intended roles have access to those
 APIs.
 
-Patrole currently offers testing for the following OpenStack services: Nova,
-Neutron, Glance, Cinder and Keystone.
-
 Patrole is currently undergoing heavy development. As more projects move
 toward policy in code, Patrole will align its testing with the appropriate
 documentation.
@@ -205,7 +202,11 @@
 For more information about RBAC, reference the `rbac-overview`_
 documentation page.
 
+For information regarding which projects Patrole offers RBAC testing for,
+reference the `HACKING`_ documentation page.
+
 .. _rbac-overview: https://docs.openstack.org/patrole/latest/rbac-overview.html
+.. _HACKING: https://docs.openstack.org/patrole/latest/HACKING.html#supported-openstack-components
 
 Unit Tests
 ----------