diff --git a/buffet/dbus_bindings/org.chromium.Buffet.Manager.xml b/buffet/dbus_bindings/org.chromium.Buffet.Manager.xml
index 7ec49a7..8473fe2 100644
--- a/buffet/dbus_bindings/org.chromium.Buffet.Manager.xml
+++ b/buffet/dbus_bindings/org.chromium.Buffet.Manager.xml
@@ -61,5 +61,10 @@
         GCD ID if the device is registered or empty otherwise.
       </tp:docstring>
     </property>
+    <property name="CommandDefs" type="s" access="read">
+      <tp:docstring>
+        JSON with command definitions of the devices.
+      </tp:docstring>
+    </property>
   </interface>
 </node>