diff --git a/av/format/flv/videodata.go b/av/format/flv/videodata.go
index 00dd1cf..56936c9 100644
--- a/av/format/flv/videodata.go
+++ b/av/format/flv/videodata.go
@@ -167,6 +167,28 @@ func (videoData *VideoData) Marshal() ([]byte, error) {
 }
 
 // AVCDecoderConfigurationRecord .
+// aligned(8) class AVCDecoderConfigurationRecord {
+//     unsigned int(8) configurationVersion = 1;
+//     unsigned int(8) AVCProfileIndication;
+//     unsigned int(8) profile_compatibility;
+//     unsigned int(8) AVCLevelIndication;
+
+//     bit(6) reserved = '111111'b;
+//     unsigned int(2) lengthSizeMinusOne;
+
+//     bit(3) reserved = '111'b;
+//     unsigned int(5) numOfSequenceParameterSets;
+//
+//     for (i=0; i< numOfSequenceParameterSets; i++) {
+//     	unsigned int(16) sequenceParameterSetLength ;
+//         bit(8*sequenceParameterSetLength) sequenceParameterSetNALUnit;
+//     }
+//     unsigned int(8) numOfPictureParameterSets;
+//     for (i=0; i< numOfPictureParameterSets; i++) {
+//     	unsigned int(16) pictureParameterSetLength;
+//     	bit(8*pictureParameterSetLength) pictureParameterSetNALUnit;
+//     }
+// }
 type AVCDecoderConfigurationRecord struct {
 	ConfigurationVersion byte
 	AVCProfileIndication byte