diff --git a/src/revpi_middleware/dbus_middleware1/system_config/interface_config.py b/src/revpi_middleware/dbus_middleware1/system_config/interface_config.py
index ac747dd..d07f305 100644
--- a/src/revpi_middleware/dbus_middleware1/system_config/interface_config.py
+++ b/src/revpi_middleware/dbus_middleware1/system_config/interface_config.py
@@ -48,10 +48,15 @@ class InterfaceRevpiConfig(DbusInterface):
                 <arg name="feature" type="s"/>
                 <arg name="status" type="b"/>
             </signal>
+            <signal name="AvailabilityChanged">
+                <arg name="feature" type="s"/>
+                <arg name="available" type="b"/>
+            </signal>
         </interface>
     </node>
     """
 
+    AvailabilityChanged = signal()
     StatusChanged = signal()
 
     def Disable(self, feature: str) -> None: