diff --git a/media/aidl/android/media/audio/common/AudioOutputFlags.aidl b/media/aidl/android/media/audio/common/AudioOutputFlags.aidl
index a55bfaf..315cc13 100644
--- a/media/aidl/android/media/audio/common/AudioOutputFlags.aidl
+++ b/media/aidl/android/media/audio/common/AudioOutputFlags.aidl
@@ -108,7 +108,7 @@
     /**
      * Output stream is bit perfect: the implementation guarantees that PCM
      * samples are carried untouched from audio HAL to hardware interface
-     * or DAC.
+     * or DAC. The volume command need to be sent to the hardware.
      */
     BIT_PERFECT = 18,
 }