diff --git a/aviary/examples/external_subsystems/custom_aero/simple_drag.py b/aviary/examples/external_subsystems/custom_aero/simple_drag.py
index da515d147..23a146bf8 100644
--- a/aviary/examples/external_subsystems/custom_aero/simple_drag.py
+++ b/aviary/examples/external_subsystems/custom_aero/simple_drag.py
@@ -101,4 +101,4 @@ def setup(self):
                 Aircraft.Wing.AREA,
             ],
             promotes_outputs=[Dynamic.Vehicle.DRAG],
-        )
\ No newline at end of file
+        )