diff --git a/automotive/vehicle/2.0/types.hal b/automotive/vehicle/2.0/types.hal
index e874146..7f203c4 100644
--- a/automotive/vehicle/2.0/types.hal
+++ b/automotive/vehicle/2.0/types.hal
@@ -990,6 +990,7 @@
      *
      * @change_mode VehiclePropertyChangeMode:ON_CHANGE
      * @access VehiclePropertyAccess:READ_WRITE
+     * @data_enum VehicleUnit
      */
     HVAC_TEMPERATURE_DISPLAY_UNITS = (
         0x050E