diff --git a/gpiozero/__init__.py b/gpiozero/__init__.py
index 950823e..e2a3336 100644
--- a/gpiozero/__init__.py
+++ b/gpiozero/__init__.py
@@ -24,7 +24,7 @@ from .output_devices import (
     Motor,
 )
 from .boards import (
-    TrafficLights
+    TrafficLights,
     PiTraffic,
     FishDish,
     PiLiter,