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 </p>
 
 <p>
-    The following diagram describes a general structure of each ONOS subsystem:
+    The figure below provides a visual inventory of the various ONOS subsystems.
+    The ones with the gray outline represent either work in progress features
+    planned for release in 2015.<br>
+    <img src="doc-files/onos-subsystems.png" alt="ONOS architecture tiers">
+
+</p>
+
+<p>
+    The following diagram describes the general structure of each ONOS subsystem:
     <br>
     <img src="doc-files/onos-subsystem.png" alt="ONOS subsystem structure"><br>
     For example, the device-subsystem comprises of a core