diff --git a/README.md b/README.md
index d04da25..f0d66ef 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,15 @@ Command Line Scripts for ZJU (VPN / WLAN / DNS)
 
 ## Requirements
 
+### vpn
+
+- xl2tpd
+
 ### wlan
 
 - curl
 
-- xl2tpd
+- iconv
 
 ## TODO