Apply suggestions from code review

files/en-us/web/progressive_web_apps/tutorials/cycletracker/secure_connection/index.md

@@ -21,7 +21,9 @@ With the `index.html` updated, and the `style.css` housed in the same directory,
 
 ![Light green web page with a large header, a form with a legend, two date pickers and a button. The bottom shows two placeholder menstrual cycles and a header.](filefile.jpg)
 
-We are viewing our page using the `file://` protocol. This works for the current state of our codebase, and will continue to suffice as we [add JavaScript functionality](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/JavaScript_functionality). However, PWAs require a secure connection, as do several APIs such as Service Workers. PWAs need to be served from a web server over `https` or a local development environment, using `localhost`, `127.0.0.1`, with or without a port number. If we view our finished app using the `file://` protocol, our [manifest file](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Manifest_file) will be ignored and any [service workers](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Service_workers) we add will fail.
+We are viewing our page using the `file://` protocol. This works for the current state of our codebase but not suffice as we [add JavaScript functionality](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/JavaScript_functionality).
+The reason for this is that PWAs and some of their commonly used APIs, such as the Service Worker API, require a secure connection. 
+For this reason PWAs must be served using the `https` protocol, or from a local development environment using `localhost` or `127.0.0.1` — with or without a port number. If we view our finished app using the `file://` protocol, our [manifest file](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Manifest_file) will be ignored and any [service workers](/en-US/docs/Web/Progressive_web_apps/Tutorials/CycleTracker/Service_workers) we add will fail.
 
 > **Note:** Serving your app over `https` isn't only good for PWAs, but for all websites as it ensures the information that transits between your web server and the user's browser is encrypted end to end. Several [Web APIs require secure contexts](/en-US/docs/Web/Security/Secure_Contexts/features_restricted_to_secure_contexts). Even if you aren't creating installable PWAs, as you add features to any web app, you may run into cases where a secure context is required.