diff --git a/packets/Pes.go b/packets/Pes.go
index c7147884..894072ce 100644
--- a/packets/Pes.go
+++ b/packets/Pes.go
@@ -25,26 +25,60 @@ LICENSE
 */
 
 package packets
-
+/*
+============================================================================
+| octet no | bit 0 | bit 1 | bit 2 | bit 3 | bit 4 | bit 5 | bit 6 | bit 7 |
+============================================================================
+| octet 0  | 0x00                                                          |
+----------------------------------------------------------------------------
+| octet 1  | 0x00                                                          |
+----------------------------------------------------------------------------
+| octet 2  | 0x01                                                          |
+----------------------------------------------------------------------------
+| octet 3  | Stream ID (0xE0 for video)                                    |
+----------------------------------------------------------------------------
+| octet 4  | PES Packet Length (no bytes in packet after this field)       |
+----------------------------------------------------------------------------
+| octet 5  | PES Length cont.                                              |
+----------------------------------------------------------------------------
+| octet 6  | 0x2           |  SC           | Prior | DAI   | Copyr | Copy  |
+----------------------------------------------------------------------------
+| octet 7  | PDI           | ESCRF | ESRF  | DSMTMF| ACIF  | CRCF  | EF    |
+----------------------------------------------------------------------------
+| octet 8  | PES Header Length                                             |
+----------------------------------------------------------------------------
+| optional | optional fields (determined by flags above) (variable Length) |
+----------------------------------------------------------------------------
+| -        | ...                                                           |
+----------------------------------------------------------------------------
+| optional | stuffing bytes (varible length)                               |
+----------------------------------------------------------------------------
+| -        | ...                                                           |
+----------------------------------------------------------------------------
+| Optional | Data (variable length)                                        |
+----------------------------------------------------------------------------
+| -        | ...                                                           |
+----------------------------------------------------------------------------
+*/
 type PESPacket struct {
 	StreamID          byte
 	Length            uint16
-	ScramblingControl byte
-	Priority          bool
-	DAI               bool // data alginment indicator
-	Copyright         bool
-	Original          bool
+	SC 								byte // Scrambling control
+	Priority          bool // Priority Indicator
+	DAI               bool // Data alginment indicator
+	Copyright         bool // Copyright indicator
+	Original          bool // Original data indicator
 	PDI               byte // PTS DTS indicator
-	ESCR              bool
-	ESRate            bool
-	DSMTrickMode      bool
-	ACI               bool // additional copy info flag
-	CRC               bool
-	Ext               bool
-	HeaderLength      byte
-	OptFields         []byte
-	Stuffing          []byte
-	Data              []byte
+	ESCRF              bool // Elementary stream clock reference flag
+	ESRF            		bool // Elementary stream rate reference flag
+	DSMTMF     bool // Dsm trick mode flag
+	ACI               bool // Additional copy info flag
+	CRC               bool //
+	EF                bool // Extension flag
+	HeaderLength      byte // Pes header length
+	OptFields         []byte // Optional fields
+	Stuffing          []byte // Stuffing bytes
+	Data              []byte // Pes packet data
 }
 
 func (p *PESPacket) ToByteSlice() (output []byte) {