diff --git a/rel/files/emqttd.config b/rel/files/emqttd.config
index aa63385a5..97cdc9a18 100644
--- a/rel/files/emqttd.config
+++ b/rel/files/emqttd.config
@@ -45,8 +45,22 @@
         {auth, [
             %% Authentication with username, password
             %{username, []},
+            
             %% Authentication with clientid
             %{clientid, [{password, no}, {file, "etc/clients.config"}]},
+
+            %% Authentication with LDAP
+            % {ldap, [
+            %    {servers, ["localhost"]},
+            %    {port, 389},
+            %    {timeout, 30},
+            %    {user_dn, "uid=$u,ou=People,dc=example,dc=com"},
+            %    {ssl, fasle},
+            %    {sslopts, [
+            %        {"certfile", "ssl.crt"},
+            %        {"keyfile", "ssl.key"}]}
+            % ]},
+
             %% Allow all
             {anonymous, []}
         ]},