diff --git a/lib/index.js b/lib/index.js
index 59eca58..302d496 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -23,7 +23,7 @@ const PushNotification = options => {
       return Promise.reject(new Error('unknow device type'));
     },
 
-    pushToAPN(tokens, {title, message, badge, sound = 'default', payload}) {
+    pushToAPN(tokens, {title, message, badge, sound = 'default', payload, topic=''}) {
       if (!apnSender) {
         return Promise.reject(new Error('options.apn is required...'));
       }
@@ -35,7 +35,8 @@ const PushNotification = options => {
         alert: {title, body: message},
         sound,
         badge,
-        payload
+        payload,
+        topic
       });
       return apnSender.send(notification, devices);
     },