diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
index 0d861cb..39d8433 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -3508,6 +3508,10 @@
      * Set true to enable BSW and false to disable BSW. When BSW is enabled, the ADAS system in the
      * vehicle should be turned on and monitoring for objects in the vehicle’s blind spots.
      *
+     * If BSW is not available, IVehicle#get must not return any NOT_AVAILABLE value in StatusCode.
+     * Other StatusCode values like TRY_AGAIN may still be used as needed. For example, if BSW is
+     * not available because the vehicle speed is too low, IVehicle#get must return false.
+     *
      * This property is defined as read_write, but OEMs have the option to implement it as read
      * only.
      *