diff --git a/loc-chase2.js b/loc-chase2.js
index 99f7e9c..316659d 100644
--- a/loc-chase2.js
+++ b/loc-chase2.js
@@ -83,5 +83,13 @@
 
   document.getElementById("stop")
     .addEventListener("click", stopLOC);
+    
+    if ('serviceWorker' in navigator) {
+      navigator.serviceWorker.register('./serviceworker.js')
+  	.then(()=> {
+  	    console.log('service worker registered'); //なくてもよい
+  	});
+  }
+
 
 }, false);