diff --git a/src/serviceWorker/service_worker.js b/src/serviceWorker/service_worker.js
index 017c74aa..e1a10c53 100644
--- a/src/serviceWorker/service_worker.js
+++ b/src/serviceWorker/service_worker.js
@@ -4,7 +4,12 @@ import {APP_NAME} from '../constant';
 self.addEventListener('install', event => { // register
   console.log('serviceWorker installed');
   event.waitUntil(async () => {
-    await caches.open(APP_NAME);
+    await caches.open(APP_NAME).then(
+      cache => cache.addAll([
+        '/',
+        '/index.html',
+      ])
+    );
     console.log('serviceWorker installed...');
   });
 });