diff --git a/doc/source/benefits.rst b/doc/source/benefits.rst
index d2cc582a..e5cdf570 100644
--- a/doc/source/benefits.rst
+++ b/doc/source/benefits.rst
@@ -25,9 +25,16 @@ infrastructure components.
 What systems are covered by openstack-ansible-security?
 -------------------------------------------------------
 
-At this time, the openstack-ansible-security role provides security hardening
-for physical servers running Ubuntu 14.04.  The containers that run various
-OpenStack services on these physical servers are currently out of scope.
+The openstack-ansible-security role provides security hardening for physical
+servers running the following Linux distributions:
+
+* Ubuntu 14.04
+* Ubuntu 16.04
+* CentOS 7
+* Red Hat Enterprise Linux 7
+
+The containers that run various OpenStack services on physical servers in
+OpenStack-Ansible deployments are currently out of scope.
 
 Virtual machines that are created within the OpenStack environment are also
 not affected by this role, although this role could be applied within those
diff --git a/doc/source/index.rst b/doc/source/index.rst
index b83944dd..59f5c1be 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -28,8 +28,12 @@ Newton: Development
 ===================
 
 The openstack-ansible-security role is currently under development for the
-Newton release. The Newton release will add support Ubuntu 16.04 and CentOS 7
-in addition to the existing support for Ubuntu 14.04.
+Newton release. The Newton release supports the following Linux distributions:
+
+* Ubuntu 14.04
+* Ubuntu 16.04
+* CentOS 7
+* Red Hat Enterprise Linux 7 `(partial automated test coverage)`
 
 .. toctree::
    :maxdepth: 2
@@ -48,6 +52,8 @@ with the 13.0.0 tag on April 1st, 2016.  Refer to the `Mitaka release notes
 <http://docs.openstack.org/releasenotes/openstack-ansible-security/mitaka.html>`_
 for more details on the improvements and fixes.
 
+Ubuntu 14.04 is supported in the Mitaka release.
+
 * `openstack-ansible-security Mitaka Documentation`_
 
 .. _openstack-ansible-security Mitaka Documentation: http://docs.openstack.org/developer/openstack-ansible-security/mitaka/
@@ -59,6 +65,8 @@ Refer to the `Liberty release notes
 <http://docs.openstack.org/releasenotes/openstack-ansible-security/liberty.html>`_
 for more details on the improvements and fixes.
 
+Ubuntu 14.04 is supported in the Liberty release.
+
 * `openstack-ansible-security Liberty Documentation`_
 
 .. _openstack-ansible-security Liberty Documentation: http://docs.openstack.org/developer/openstack-ansible-security/liberty/