Fix extension typo

index.html

@@ -216,7 +216,7 @@ <h3 id="definitions-">Definitions:</h3>
 </ul>
 <h3 id="next-quick-start-quick-start-">Next: <a href="#quick-start">Quick start</a></h3>
 <h2 id="quick-start">Quick start</h2>
-<p>The Electron Quick Start repository is a bare-bones Electron app with the <code>package.json</code>, <code>main.js</code> and <code>index.js</code> you&#39;ve learned about here—a great place to get started! Also, check out the boilerplates for templates with your framework of choice.</p>
+<p>The Electron Quick Start repository is a bare-bones Electron app with the <code>package.json</code>, <code>main.js</code> and <code>index.html</code> you&#39;ve learned about here—a great place to get started! Also, check out the boilerplates for templates with your framework of choice.</p>
 <h3 id="next-packaging-packaging-">Next: <a href="#packaging">Packaging</a></h3>
 <h3 id="resources-">Resources:</h3>
 <ul>

index.md

@@ -176,7 +176,7 @@ Electron apps are like Node apps and use a <span class="def">`package.json` file
 
 ## Quick start
 
-The Electron Quick Start repository is a bare-bones Electron app with the `package.json`, `main.js` and `index.js` you've learned about here—a great place to get started! Also, check out the boilerplates for templates with your framework of choice.
+The Electron Quick Start repository is a bare-bones Electron app with the `package.json`, `main.js` and `index.html` you've learned about here—a great place to get started! Also, check out the boilerplates for templates with your framework of choice.
 
 ### Next: [Packaging](#packaging)