diff --git a/packetWin7/npf/npf/Read.c b/packetWin7/npf/npf/Read.c
index 6d7169e7..4ba8a868 100644
--- a/packetWin7/npf/npf/Read.c
+++ b/packetWin7/npf/npf/Read.c
@@ -877,6 +877,7 @@ NPF_TapExForEachOpen(
 
 						if (withVlanTag)
 						{
+							// Insert a tag in the case of IEEE802.1Q packet
 							pHeaderBuffer = ExAllocatePoolWithTag(NonPagedPool, fres + 4, 'NPCA');
 							NdisMoveMappedMemory(pHeaderBuffer, HeaderBuffer, 12);
 							pHeaderBuffer[12] = 0x81;
diff --git a/packetWin7/npf/npf/Write.c b/packetWin7/npf/npf/Write.c
index 7e7b6daf..82642584 100644
--- a/packetWin7/npf/npf/Write.c
+++ b/packetWin7/npf/npf/Write.c
@@ -248,6 +248,47 @@ NPF_Write(
 			NPFSetNBLChildOpen(pNetBufferList, Open); //save the child open object in the packets
 			//SendFlags |= NDIS_SEND_FLAGS_CHECK_FOR_LOOPBACK;
 
+			// Recognize IEEE802.1Q tagged packet, as no many adapters support VLAN tag packet sending, no much use for end users,
+			// and this code examines the data which lacks efficiency, so I left it commented, the sending part is also unfinished.
+			// This code refers to Win10Pcap at https://github.com/SoftEtherVPN/Win10Pcap.
+// 			if (Open->Loopback == FALSE)
+// 			{
+// 				PUCHAR pHeaderBuffer;
+// 				UINT iFres;
+//
+// 				BOOLEAN withVlanTag = FALSE;
+// 				UINT VlanID = 0;
+// 				UINT VlanUserPriority = 0;
+// 				UINT VlanCanFormatID = 0;
+//
+// 				NdisQueryMdl(
+// 					Irp->MdlAddress,
+// 					&pHeaderBuffer,
+// 					&iFres,
+// 					NormalPagePriority);
+//
+// 				// Determine if the packet is IEEE802.1Q tagged packet.
+// 				if (iFres >= 18)
+// 				{
+// 					if (pHeaderBuffer[12] == 0x81 && pHeaderBuffer[13] == 0x00)
+// 					{
+// 						USHORT pTmpVlanTag = 0;
+//
+// 						((UCHAR *)(&pTmpVlanTag))[0] = pHeaderBuffer[15];
+// 						((UCHAR *)(&pTmpVlanTag))[1] = pHeaderBuffer[14];
+//
+// 						VlanID = pTmpVlanTag & 0x0FFF;
+// 						VlanUserPriority = (pTmpVlanTag >> 13) & 0x07;
+// 						VlanCanFormatID = (pTmpVlanTag >> 12) & 0x01;
+//
+// 						if (VlanID != 0)
+// 						{
+// 							withVlanTag = TRUE;
+// 						}
+// 					}
+// 				}
+// 			}
+
 			//
 			//  Call the MAC
 			//