diff --git a/README.md b/README.md
index 114c5eb6..f5d24cb5 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ GoDoc at https://godoc.org/github.com/riobard/go-shadowsocks2/
 - UDP tunneling (e.g. tunneling DNS)
 - TCP tunneling (e.g. benchmark with iperf3)
 
+
 ## Install
 
 ```sh
@@ -33,6 +34,7 @@ Client
 
 ```sh
 go-shadowsocks2 -c [server_address]:8488 -cipher aes-128-gcm -key 1234567890abcdef1234567890abcdef \
-    -socks :1080 -udptun :1080=8.8.8.8:53,:1081=8.8.4.4:53 -tcptun :1082=localhost:5201
+    -socks :1080 -udptun :1080=8.8.8.8:53,:1081=8.8.4.4:53 -tcptun :1082=localhost:5201 -verbose
 ```
 
+Keys are in hexdecimal format.
\ No newline at end of file