diff --git a/multimedia/av_codec/native_avdemuxer.h b/multimedia/av_codec/native_avdemuxer.h
index 7b2117ebceeeb3cf9ebab50c1a54fb4db73d18d3..17b3b5f1d8be08b49cf4bf08973d9aa589e53e17 100644
--- a/multimedia/av_codec/native_avdemuxer.h
+++ b/multimedia/av_codec/native_avdemuxer.h
@@ -41,12 +41,20 @@ extern "C" {
  * @since 10
  */
 typedef struct OH_AVDemuxer OH_AVDemuxer;
+
 /**
  * @brief Forward declaration of DRM_MediaKeySystemInfo.
  *
  * @since 11
  */
 typedef struct DRM_MediaKeySystemInfo DRM_MediaKeySystemInfo;
+
+/**
+ * @brief After this callback is set, it will be invoked when DRM information is updated.
+ *
+ * @param mediaKeySystemInfo DRM information.
+ * @since 11
+ */
 typedef void (*DRM_MediaKeySystemInfoCallback)(DRM_MediaKeySystemInfo* mediaKeySystemInfo);
 
 /**