diff --git a/container/mts/payload.go b/container/mts/payload.go
index 9785f2f0..d05e994e 100644
--- a/container/mts/payload.go
+++ b/container/mts/payload.go
@@ -184,6 +184,8 @@ var (
 	errMetaUpperBound = errors.New("meta 'to' cannot be found")
 )
 
+// BytesForMetaInterval will return the media data as a slice between two meta
+// values 'from' and 'to', of key 'key'. The meta values must not be the same.
 func (c *Clip) BytesForMetaInterval(key, from, to string) ([]byte, error) {
 	// First check that the interval makes sense.
 	if from == to {
diff --git a/container/mts/payload_test.go b/container/mts/payload_test.go
index 3ae114e7..d56ca516 100644
--- a/container/mts/payload_test.go
+++ b/container/mts/payload_test.go
@@ -316,6 +316,8 @@ func TestBytesForPTSInterval(t *testing.T) {
 	}
 }
 
+// TestBytesForMetaInterval checks that we can correctly get media data between
+// two meta values using BytesForMetaInterval.
 func TestBytesForMetaInterval(t *testing.T) {
 	const (
 		numOfTestFrames = 10