diff --git a/opendbc/car/honda/carcontroller.py b/opendbc/car/honda/carcontroller.py
index 85199a2b91..b899ca0d8f 100644
--- a/opendbc/car/honda/carcontroller.py
+++ b/opendbc/car/honda/carcontroller.py
@@ -228,6 +228,7 @@ def update(self, CC, CS, now_nanos):
           self.brake = apply_brake / self.params.NIDEC_BRAKE_MAX
 
     # Send dashboard UI commands.
+    # On Nidec, this controls longitudinal positive acceleration
     if self.frame % 10 == 0:
       hud = HUDData(int(pcm_accel), int(round(hud_v_cruise)), hud_control.leadVisible,
                     hud_control.lanesVisible, fcw_display, acc_alert, steer_required, hud_control.leadDistanceBars)