diff --git a/stream/mts/psi/psi_test.go b/stream/mts/psi/psi_test.go
index 0c189021..3d3a74a7 100644
--- a/stream/mts/psi/psi_test.go
+++ b/stream/mts/psi/psi_test.go
@@ -193,7 +193,7 @@ var bytesTests = []struct {
 }
 
 // TestBytes ensures that the Bytes() funcs are working correctly to take PSI
-// structs and converting them to byte slices
+// structs and convert them to byte slices
 func TestBytes(t *testing.T) {
 	for _, test := range bytesTests {
 		got := test.input.Bytes()
@@ -206,7 +206,7 @@ func TestBytes(t *testing.T) {
 	}
 }
 
-// A quick sanity check of the int64 time to []byte func
+// TestTimestampToBytes is a quick sanity check of the int64 time to []byte func
 func TestTimestampToBytes(t *testing.T) {
 	tb := TimeBytes(tstTime1)
 	if !bytes.Equal(timeSlice, tb) {
@@ -214,6 +214,7 @@ func TestTimestampToBytes(t *testing.T) {
 	}
 }
 
+// TestTimeUpdate checks to see if we can correctly update the timstamp in pmt
 func TestTimeUpdate(t *testing.T) {
 	cpy := make([]byte, len(pmtTimeBytes1))
 	copy(cpy, pmtTimeBytes1)
@@ -226,6 +227,7 @@ func TestTimeUpdate(t *testing.T) {
 	}
 }
 
+// TestTimeGet tsts to see if we can correctly get the timestamp from a pmt
 func TestTimeGet(t *testing.T) {
 	s, err := TimeOf(pmtTimeBytes1)
 	if err != nil {
@@ -236,6 +238,7 @@ func TestTimeGet(t *testing.T) {
 	}
 }
 
+// TestGpsUpdate checks to see if we can update the gps string in a pmt correctly
 func TestGpsUpdate(t *testing.T) {
 	cpy := make([]byte, len(pmtTimeGpsBytes1))
 	copy(cpy, pmtTimeGpsBytes1)
@@ -248,6 +251,9 @@ func TestGpsUpdate(t *testing.T) {
 	}
 }
 
+// buildPmtTimeGpsBytes is a helper function to help construct the byte slices
+// for pmts with time and gps, as the gps data field is 32 bytes, i.e. quite large
+// to type out
 func buildPmtTimeGpsBytes(tstStr string) []byte {
 	return append(append(append(make([]byte, 0), pmtTimeGpsBytesPart1...),
 		GpsStrBytes(tstStr)...), pmtTimeGpsBytesPart2...)