diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleIgnitionState.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleIgnitionState.aidl
index 4de97f6639..2338008d59 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleIgnitionState.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleIgnitionState.aidl
@@ -28,6 +28,10 @@ enum VehicleIgnitionState {
      * Steering wheel is not locked, engine and all accessories are OFF. If
      * car can be in LOCK and OFF state at the same time than HAL must report
      * LOCK state.
+     *
+     * If IGNITION_STATE is implemented on a BEV, then this state must
+     * communicate that the BEV's High Voltage battery is disconnected and thus
+     * the vehicle is OFF.
      */
     OFF,
     /**
@@ -38,6 +42,10 @@ enum VehicleIgnitionState {
     /**
      * Ignition is in state ON. Accessories and instrument cluster available,
      * engine might be running or ready to be started.
+     *
+     * If IGNITION_STATE is implemented on a BEV, then this state must
+     * communicate that the BEV's High Voltage battery is connected and thus the
+     * vehicle is ON.
      */
     ON,
     /**