diff --git a/doc/source/dev/strategy-plugin.rst b/doc/source/dev/strategy-plugin.rst
index d91014e36..61df43ec3 100644
--- a/doc/source/dev/strategy-plugin.rst
+++ b/doc/source/dev/strategy-plugin.rst
@@ -128,13 +128,27 @@ check/configure the latter so your new strategy can be fully functional.
 Querying metrics
 ----------------
 
-The metrics available depend on the hypervisors that OpenStack manages on
-the specific implementation. You can find the metrics available per hypervisor
-and OpenStack release on the OpenStack site.
+A large set of metrics, generated by OpenStack modules, can be used in your
+strategy implementation. To collect these metrics, Watcher provides a
+`Helper`_ to the Ceilometer API, which makes this API reusable and easier
+to used.
 
-There are different possible ways to obtain usage metrics in Watcher, you can
-use the default Ceilometer API or our Helper.
-The Helper attempted to make the Ceilometer API more reusable and easy to use.
+If you want to use your own metrics database backend, please refer to the
+`Ceilometer developer guide`_. Indeed, Ceilometer's pluggable model allows
+for various types of backends.  A list of the available backends is located
+here_. The Ceilosca project is a good example of how to create your own
+pluggable backend.
+
+
+Finally, if your strategy requires new metrics not covered by Ceilometer, you
+can add them through a Ceilometer `plugin`_.
+
+
+.. _`Helper`: https://github.com/openstack/watcher/blob/master/watcher/metrics_engine/cluster_history/ceilometer.py#L31
+.. _`Ceilometer developer guide`: http://docs.openstack.org/developer/ceilometer/architecture.html#storing-the-data
+.. _`here`: http://docs.openstack.org/developer/ceilometer/install/dbreco.html#choosing-a-database-backend
+.. _`plugin`: http://docs.openstack.org/developer/ceilometer/plugins.html
+.. _`Ceilosca`: https://github.com/openstack/monasca-ceilometer/blob/master/ceilosca/ceilometer/storage/impl_monasca.py
 
 Read usage metrics using the Python binding
 -------------------------------------------