diff --git a/docs/images/composed_devices.dot b/docs/images/composed_devices.dot
index fa43d3b..2a13174 100644
--- a/docs/images/composed_devices.dot
+++ b/docs/images/composed_devices.dot
@@ -16,4 +16,5 @@ digraph classes {
     TrafficLightsBuzzer->Button;
 
     Robot->Motor;
+    Motor->PWMOutputDevice;
 }