diff --git a/Encryption.md b/Encryption.md
index 9394029..212b02f 100644
--- a/Encryption.md
+++ b/Encryption.md
@@ -53,6 +53,7 @@ You can use [this script](https://github.com/clowwindy/shadowsocks/blob/master/t
 
 Deprecated Ciphers
 ==================
-These ciphers are legacy and not safe. Do not use them:
+These legacy ciphers are either slow or not safe. Do not use them:
 - rc4
 - table
+- salsa20-ctr