diff --git a/src/emqttd_auth_mod.erl b/src/emqttd_auth_mod.erl
index 14e4468e3..c94578c46 100644
--- a/src/emqttd_auth_mod.erl
+++ b/src/emqttd_auth_mod.erl
@@ -22,7 +22,7 @@
 
 -export([passwd_hash/2]).
 
--type(hash_type() :: plain | md5 | sha | sha256 | pbkdf2).
+-type(hash_type() :: plain | md5 | sha | sha256 | pbkdf2 | bcrypt).
 
 %%--------------------------------------------------------------------
 %% Authentication behavihour