diff --git a/src/endpoint/endpoint_subscription.erl b/src/endpoint/endpoint_subscription.erl
index 0369af0..8dfcbc2 100644
--- a/src/endpoint/endpoint_subscription.erl
+++ b/src/endpoint/endpoint_subscription.erl
@@ -90,6 +90,7 @@ init([]) ->
 %%  同一个SubscriberPid只能订阅同一个topic一次
 handle_call(get_subscribers, _From, State = #state{subscribers = Subscribers}) ->
     {reply, {ok, Subscribers}, State};
+
 handle_call({subscribe, Topic, SubscriberPid}, _From, State = #state{subscribers = Subscribers}) ->
     Components = of_components(Topic),
     case is_valid_components(Components) of
@@ -112,6 +113,7 @@ handle_call({subscribe, Topic, SubscriberPid}, _From, State = #state{subscribers
         false ->
             {reply, {error, <<"invalid topic name">>}, State}
     end;
+
 handle_call({unsubscribe, Topic, SubscriberPid}, _From, State = #state{subscribers = Subscribers}) ->
     {Removed, Reserved} = lists:partition(fun(#subscriber{topic = Topic0, subscriber_pid = SubscriberPid0}) ->
         Topic =:= Topic0 andalso SubscriberPid =:= SubscriberPid0