diff --git a/README.md b/README.md
index bd57d2e..bed23ca 100644
--- a/README.md
+++ b/README.md
@@ -55,10 +55,10 @@ Assume your server ip is 44.55.66.77, you have a service listening on udp port 7
 
 ```bash
 # Run at server side:
-./speederv2 -s -l0.0.0.0:4096 -r 127.0.0.1:7777  -f20:10
+./speederv2 -s -l0.0.0.0:4096 -r 127.0.0.1:7777  -f20:10 -k "passwd"
 
 # Run at client side
-./speederv2 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -f20:10
+./speederv2 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -f20:10 -k "passwd"
 ```
 
 Now connecting to UDP port 3333 at the client side is equivalent to connecting to port 7777 at the server side,and the connection is boosted by UDPspeeder.
@@ -67,6 +67,7 @@ Now connecting to UDP port 3333 at the client side is equivalent to connecting t
 
 `-f20:10` means sending 10 redundant packets for every 20 original packets.
 
+`-k` enables simple XOR encryption to confuse DPI(Deep Packet Inspection)
 # Advanced Topic
 ### Full Options
 ```