diff --git a/audio/aidl/android/hardware/audio/effect/Spatializer.aidl b/audio/aidl/android/hardware/audio/effect/Spatializer.aidl
index 6ebe0d58c0..71e3ffefe6 100644
--- a/audio/aidl/android/hardware/audio/effect/Spatializer.aidl
+++ b/audio/aidl/android/hardware/audio/effect/Spatializer.aidl
@@ -67,7 +67,8 @@ union Spatializer {
     Spatialization.Mode spatializationMode;
 
     /**
-     * Head tracking sensor ID.
+     * Identifies the head tracking sensor using its unique sensor ID.
+     * The value corresponds to android.hardware.sensors.SensorInfo.sensorHandle.
      */
     int headTrackingSensorId;