diff --git a/main.cpp b/main.cpp
index 6129537..6d349ac 100755
--- a/main.cpp
+++ b/main.cpp
@@ -2621,7 +2621,7 @@ void print_help()
 //	printf("\n");
 	printf("    --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024\n");
 	printf("    --force-sock-buf                      bypass system limitation while setting sock-buf\n");
-	printf("    --seqmode             <number>        seq increase mode for faketcp:\n");
+	printf("    --seq-mode            <number>        seq increase mode for faketcp:\n");
 	printf("                                          0:static header,do not increase seq and ack_seq\n");
 	printf("                                          1:increase seq for every packet,simply ack last seq\n");
 	printf("                                          2:increase seq randomly, about every 3 packets,simply ack last seq\n");
diff --git a/network.cpp b/network.cpp
index a8b69ec..ff4e37c 100644
--- a/network.cpp
+++ b/network.cpp
@@ -1687,12 +1687,12 @@ int after_send_raw0(raw_info_t &raw_info)
 				{
 					send_info.seq=raw_info.recv_info.ack_seq;
 				}
-				if(recv_info.ack_seq_counter>=3)
+				if(recv_info.ack_seq_counter>=3) //simulate tcp fast re-transmit
 				{
 					recv_info.ack_seq_counter=0;
 					send_info.seq=raw_info.recv_info.ack_seq;
 				}
-				if(larger_than_u32(raw_info.recv_info.ack_seq,send_info.seq))  //for further use,currently not useful.
+				if(larger_than_u32(raw_info.recv_info.ack_seq,send_info.seq))  //for further use,currently no effect.
 				{
 					send_info.seq=raw_info.recv_info.ack_seq;
 				}