diff --git a/src/emqx_mqtt_properties.erl b/src/emqx_mqtt_properties.erl
index 7e4633657..5df1569c6 100644
--- a/src/emqx_mqtt_properties.erl
+++ b/src/emqx_mqtt_properties.erl
@@ -1,22 +1,22 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2013-2018 EMQ Inc. All rights reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
+%%%===================================================================
+%%% Copyright (c) 2013-2018 EMQ Inc. All rights reserved.
+%%%
+%%% Licensed under the Apache License, Version 2.0 (the "License");
+%%% you may not use this file except in compliance with the License.
+%%% You may obtain a copy of the License at
+%%%
+%%%     http://www.apache.org/licenses/LICENSE-2.0
+%%%
+%%% Unless required by applicable law or agreed to in writing, software
+%%% distributed under the License is distributed on an "AS IS" BASIS,
+%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%%% See the License for the specific language governing permissions and
+%%% limitations under the License.
+%%%===================================================================
 
--module(emqx_mqtt_props).
+-module(emqx_mqtt_properties).
 
--export([name/1, id/1]).
+-export([name/1, id/1, validate/1]).
 
 %%--------------------------------------------------------------------
 %% Property id to name
@@ -109,3 +109,5 @@ id('Wildcard-Subscription-Available')   -> 16#28;
 id('Subscription-Identifier-Available') -> 16#29;
 id('Shared-Subscription-Available')     -> 16#2A.
 
+%%TODO:
+validate(Props) when is_list(Props) -> ok.