diff --git a/sim/visuals/board.ts b/sim/visuals/board.ts
index 7d6b2ed4..b90e47fd 100644
--- a/sim/visuals/board.ts
+++ b/sim/visuals/board.ts
@@ -212,6 +212,7 @@ namespace pxsim.visuals {
                 }
                 case NodeType.MediumMotor:
                 case NodeType.LargeMotor: {
+                    // TODO: figure out if the motor is in "input" or "output" mode
                     const state = ev3board().getMotors()[port];
                     view = new MotorReporterControl(this.element, this.defs, state, port);
                     break;