clarification on how to deactivate the cache in development

In the ReadMe you have mentioned

> `assets/sw.js` script will try to cache our app, and loads the cached version when it cannot connect to server allowing your app to work offline (like PWA). appending `#dev` to `index.html` will skip this caching, allowing us to load the latest builds during development.

Please could you indicate where to add the `#dev`. Should I add it to the `filesToCache` variable inside the `sw.js`, should i rename the `index.html` at the root folder or should I append it to the content of `index.html` at the root folder.

Sorry if my question seems dumb