diff --git a/protocol/rtsp/rtsp_test.go b/protocol/rtsp/rtsp_test.go
index 576f315b..848ebb00 100644
--- a/protocol/rtsp/rtsp_test.go
+++ b/protocol/rtsp/rtsp_test.go
@@ -272,6 +272,7 @@ func rmSeqNum(s []string) ([]string, bool) {
 }
 
 func TestReadResponse(t *testing.T) {
+	// input has been obtained from a valid RTSP response.
 	input := []byte{
 		0x52, 0x54, 0x53, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x20, 0x32, 0x30, 0x30, 0x20, 0x4f, 0x4b, 0x0d, // |RTSP/1.0 200 OK.|
 		0x0a, 0x43, 0x53, 0x65, 0x71, 0x3a, 0x20, 0x32, 0x0d, 0x0a, 0x44, 0x61, 0x74, 0x65, 0x3a, 0x20, // |.CSeq: 2..Date: |
@@ -284,6 +285,7 @@ func TestReadResponse(t *testing.T) {
 		0x53, 0x45, 0x54, 0x5f, 0x50, 0x41, 0x52, 0x41, 0x4d, 0x45, 0x54, 0x45, 0x52, 0x0d, 0x0a, 0x0d, // |SET_PARAMETER...|
 		0x0a,
 	}
+
 	expect := Response{
 		Proto:         "RTSP",
 		ProtoMajor:    1,
@@ -296,6 +298,7 @@ func TestReadResponse(t *testing.T) {
 			"Public": []string{"OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, GET_PARAMETER, SET_PARAMETER"},
 		},
 	}
+
 	got, err := ReadResponse(bytes.NewReader(input))
 	if err != nil {
 		t.Fatalf("should not have got error: %v", err)
@@ -306,6 +309,7 @@ func TestReadResponse(t *testing.T) {
 	}
 }
 
+// respEqual checks the equality of two Responses.
 func respEqual(got, want Response) bool {
 	for _, f := range [][2]interface{}{
 		{got.Proto, want.Proto},
@@ -327,9 +331,11 @@ func respEqual(got, want Response) bool {
 		if k == "Cseq" {
 			continue
 		}
+
 		if len(v) != len(want.Header[k]) {
 			return false
 		}
+
 		for i, _v := range v {
 			if _v != want.Header[k][i] {
 				return false