diff --git a/stream/mts/psi/psi.go b/stream/mts/psi/psi.go
index 07d460bb..f046496e 100644
--- a/stream/mts/psi/psi.go
+++ b/stream/mts/psi/psi.go
@@ -72,26 +72,26 @@ type PSI struct {
 
 // Table syntax section
 type TSS struct {
-	Tide uint16 // Table ID extension
-	V    byte   // Version number
-	Cni  bool   // Current/next indicator
-	Sn   byte   // Section number
-	Lsn  byte   // Last section number
-	Sd   SD     // Specific data PAT/PMT
+	Tide uint16       // Table ID extension
+	V    byte         // Version number
+	Cni  bool         // Current/next indicator
+	Sn   byte         // Section number
+	Lsn  byte         // Last section number
+	Sd   SpecificData // Specific data PAT/PMT
 }
 
 // Specific Data, (could be PAT or PMT)
-type SD interface {
+type SpecificData interface {
 	Bytes() []byte
 }
 
-// Program association table, implements SD
+// Program association table, implements SpecificData
 type PAT struct {
 	Pn    uint16 // Program Number
 	Pmpid uint16 // Program map PID
 }
 
-// Program mapping table, implements SD
+// Program mapping table, implements SpecificData
 type PMT struct {
 	Pcrpid uint16 // Program clock reference pid
 	Pil    uint16 // Program info length