diff --git a/preview/talk.html b/preview/talk.html
index 7d439ec..e546cb2 100644
--- a/preview/talk.html
+++ b/preview/talk.html
@@ -8,10 +8,6 @@ Hello
 		// precaching requests don't degrade the first visit experience.
 		// See https://developers.google.com/web/fundamentals/instant-and-offline/service-worker/registration
 		window.addEventListener('load', function () {
-			// Your service-worker.js *must* be located at the top-level directory relative to your site.
-			// It won't be able to control pages unless it's located at the same level or higher than them.
-			// *Don't* register service worker file in, e.g., a scripts/ sub-directory!
-			// See https://github.com/slightlyoff/ServiceWorker/issues/468
 			navigator.serviceWorker
 				.register('service-worker.js')
 				.then(function (reg) {
@@ -25,23 +21,7 @@ Hello
 							/* eslint-disable default-case */
 							switch (installingWorker.state) {
 								case 'installed':
-									if (navigator.serviceWorker.controller) {
-										// At this point, the old content will have been purged and the fresh content will
-										// have been added to the cache.
-										// It's the perfect time to display a "New content is available; please refresh."
-										// message in the page's interface.
-										console.log('New or updated content is available.');
-
-									} else {
-										// At this point, everything has been precached.
-										// It's the perfect time to display a "Content is cached for offline use." message.
-										console.log('Content is now available offline!');
-										if (window.alertsService) {
-											window.alertsService.add(
-												'Web Maker is now ready to be used offline.'
-											);
-										}
-									}
+									console.log('New or updated content is available.');
 									break;
 
 								case 'redundant':