diff --git a/hevc/hevcdecoderconfigurationrecord.go b/hevc/hevcdecoderconfigurationrecord.go
index 9ddf1008..c25c912f 100644
--- a/hevc/hevcdecoderconfigurationrecord.go
+++ b/hevc/hevcdecoderconfigurationrecord.go
@@ -34,11 +34,13 @@ type HEVCDecConfRec struct {
 	NaluArrays                       []NaluArray
 }
 
+// NaluArray - HEVC NALU array including complete bit and type
 type NaluArray struct {
 	completeAndType byte
 	Nalus           [][]byte
 }
 
+// NewNaluArray - create an HEVC NaluArray
 func NewNaluArray(complete bool, naluType NaluType, nalus [][]byte) *NaluArray {
 	var completeBit byte
 	if complete {
@@ -50,10 +52,12 @@ func NewNaluArray(complete bool, naluType NaluType, nalus [][]byte) *NaluArray {
 	}
 }
 
+// NaluType - return NaluType for NaluArray
 func (n *NaluArray) NaluType() NaluType {
 	return NaluType(n.completeAndType & 0x3f)
 }
 
+// Complete - return 0x1 if complete
 func (n *NaluArray) Complete() byte {
 	return n.completeAndType >> 7
 }
diff --git a/mp4/hvcc.go b/mp4/hvcc.go
index 4629d955..84cf8566 100644
--- a/mp4/hvcc.go
+++ b/mp4/hvcc.go
@@ -53,6 +53,7 @@ func (b *HvcCBox) Encode(w io.Writer) error {
 	return b.HEVCDecConfRec.Encode(w)
 }
 
+// Info - box-specific Info
 func (b *HvcCBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
 	bd := newInfoDumper(w, indent, b, -1)
 	hdcr := b.HEVCDecConfRec