diff --git a/shadowsocksR.sh b/shadowsocksR.sh
index 0be0a05..dfefa48 100644
--- a/shadowsocksR.sh
+++ b/shadowsocksR.sh
@@ -50,6 +50,7 @@ auth_sha1_v4_compatible
 auth_aes128_md5
 auth_aes128_sha1
 auth_chain_a
+auth_chain_b
 )
 # obfs
 obfs=(