diff --git a/CHANGELOG.md b/CHANGELOG.md
index f59341dd9f..d6ebf4149a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 9.0.0 (TBD)
+
+* Rename CSS file [#2342](https://github.com/h5bp/html5-boilerplate/pull/2342) and JS file [#2341](https://github.com/h5bp/html5-boilerplate/pull/2341)
+
 ## 8.0.0 (June 04, 2020)
 
 * Add a sample package.json with basic Parcel commands ([#2227](https://github.com/h5bp/html5-boilerplate/pull/2229)), ([231e047](https://github.com/h5bp/html5-boilerplate/commit/231e047d270316b454156dc261e6e04da660e2a2))
diff --git a/dist/doc/html.md b/dist/doc/html.md
index 1d37456b8c..a29fddf00c 100644
--- a/dist/doc/html.md
+++ b/dist/doc/html.md
@@ -168,7 +168,7 @@ it before the other scripts in the bottom of the page:
     <script src="js/vendor/modernizr-3.10.0.min.js"></script>
     <script src="https://polyfill.io/v3/polyfill.min.js"></script>
     <script src="js/plugins.js"></script>
-    <script src="js/main.js"></script>
+    <script src="js/app.js"></script>
 </body>
 ```
 
diff --git a/dist/doc/js.md b/dist/doc/js.md
index 4d3e5537dd..542c253a2f 100644
--- a/dist/doc/js.md
+++ b/dist/doc/js.md
@@ -5,7 +5,7 @@ table of contents](TOC.md)
 
 Information about the default JavaScript included in the project.
 
-## main.js
+## app.js
 
 This file can be used to contain or reference your site/app JavaScript code. If
 you're working on something more advanced you might replace this file entirely.
diff --git a/dist/doc/usage.md b/dist/doc/usage.md
index 817d65e841..ef85525d94 100644
--- a/dist/doc/usage.md
+++ b/dist/doc/usage.md
@@ -35,7 +35,7 @@ A basic HTML5 Boilerplate site initially looks something like this:
 ├── doc
 ├── img
 ├── js
-│   ├── main.js
+│   ├── app.js
 │   ├── plugins.js
 │   └── vendor
 │       └── modernizr.min.js
diff --git a/dist/index.html b/dist/index.html
index 9409863397..a6e1472a7f 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -28,7 +28,7 @@
   <p>Hello world! This is HTML5 Boilerplate.</p>
   <script src="js/vendor/modernizr-3.11.3.min.js"></script>
   <script src="js/plugins.js"></script>
-  <script src="js/main.js"></script>
+  <script src="js/app.js"></script>
 
   <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
   <script>
diff --git a/dist/js/main.js b/dist/js/app.js
similarity index 100%
rename from dist/js/main.js
rename to dist/js/app.js
diff --git a/dist/js/vendor/modernizr-3.11.3.min.js b/dist/js/vendor/modernizr-3.11.3.min.js
index 1178c8425c..feada515d1 100644
--- a/dist/js/vendor/modernizr-3.11.3.min.js
+++ b/dist/js/vendor/modernizr-3.11.3.min.js
@@ -1,3 +1,3 @@
-/*! modernizr 3.11.3 (Custom Build) | MIT *
+/*! modernizr 3.11.2 (Custom Build) | MIT *
  * https://modernizr.com/download/?-cssanimations-csscolumns-customelements-flexbox-history-picture-pointerevents-postmessage-sizes-srcset-webgl-websockets-webworkers-addtest-domprefixes-hasevent-mq-prefixedcssvalue-prefixes-setclasses-testallprops-testprop-teststyles !*/
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\ No newline at end of file
+!function(e,t,n,r){function o(e,t){return typeof e===t}function i(e){var t=_.className,n=Modernizr._config.classPrefix||"";if(S&&(t=t.baseVal),Modernizr._config.enableJSClass){var r=new RegExp("(^|\\s)"+n+"no-js(\\s|$)");t=t.replace(r,"$1"+n+"js$2")}Modernizr._config.enableClasses&&(e.length>0&&(t+=" "+n+e.join(" "+n)),S?_.className.baseVal=t:_.className=t)}function s(e,t){if("object"==typeof e)for(var n in e)k(e,n)&&s(n,e[n]);else{e=e.toLowerCase();var r=e.split("."),o=Modernizr[r[0]];if(2===r.length&&(o=o[r[1]]),void 0!==o)return Modernizr;t="function"==typeof t?t():t,1===r.length?Modernizr[r[0]]=t:(!Modernizr[r[0]]||Modernizr[r[0]]instanceof Boolean||(Modernizr[r[0]]=new Boolean(Modernizr[r[0]])),Modernizr[r[0]][r[1]]=t),i([(t&&!1!==t?"":"no-")+r.join("-")]),Modernizr._trigger(e,t)}return Modernizr}function a(){return"function"!=typeof n.createElement?n.createElement(arguments[0]):S?n.createElementNS.call(n,"http://www.w3.org/2000/svg",arguments[0]):n.createElement.apply(n,arguments)}function l(){var e=n.body;return e||(e=a(S?"svg":"body"),e.fake=!0),e}function u(e,t,r,o){var i,s,u,f,c="modernizr",d=a("div"),p=l();if(parseInt(r,10))for(;r--;)u=a("div"),u.id=o?o[r]:c+(r+1),d.appendChild(u);return i=a("style"),i.type="text/css",i.id="s"+c,(p.fake?p:d).appendChild(i),p.appendChild(d),i.styleSheet?i.styleSheet.cssText=e:i.appendChild(n.createTextNode(e)),d.id=c,p.fake&&(p.style.background="",p.style.overflow="hidden",f=_.style.overflow,_.style.overflow="hidden",_.appendChild(p)),s=t(d,e),p.fake?(p.parentNode.removeChild(p),_.style.overflow=f,_.offsetHeight):d.parentNode.removeChild(d),!!s}function f(e,n,r){var o;if("getComputedStyle"in t){o=getComputedStyle.call(t,e,n);var i=t.console;if(null!==o)r&&(o=o.getPropertyValue(r));else if(i){var s=i.error?"error":"log";i[s].call(i,"getComputedStyle returning null, its possible modernizr test results are inaccurate")}}else o=!n&&e.currentStyle&&e.currentStyle[r];return o}function c(e,t){return!!~(""+e).indexOf(t)}function d(e){return e.replace(/([A-Z])/g,function(e,t){return"-"+t.toLowerCase()}).replace(/^ms-/,"-ms-")}function p(e,n){var o=e.length;if("CSS"in t&&"supports"in t.CSS){for(;o--;)if(t.CSS.supports(d(e[o]),n))return!0;return!1}if("CSSSupportsRule"in t){for(var i=[];o--;)i.push("("+d(e[o])+":"+n+")");return i=i.join(" or "),u("@supports ("+i+") { #modernizr { position: absolute; 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\ No newline at end of file
diff --git a/src/doc/html.md b/src/doc/html.md
index 1d37456b8c..a29fddf00c 100644
--- a/src/doc/html.md
+++ b/src/doc/html.md
@@ -168,7 +168,7 @@ it before the other scripts in the bottom of the page:
     <script src="js/vendor/modernizr-3.10.0.min.js"></script>
     <script src="https://polyfill.io/v3/polyfill.min.js"></script>
     <script src="js/plugins.js"></script>
-    <script src="js/main.js"></script>
+    <script src="js/app.js"></script>
 </body>
 ```
 
diff --git a/src/doc/js.md b/src/doc/js.md
index 4d3e5537dd..542c253a2f 100644
--- a/src/doc/js.md
+++ b/src/doc/js.md
@@ -5,7 +5,7 @@ table of contents](TOC.md)
 
 Information about the default JavaScript included in the project.
 
-## main.js
+## app.js
 
 This file can be used to contain or reference your site/app JavaScript code. If
 you're working on something more advanced you might replace this file entirely.
diff --git a/src/doc/usage.md b/src/doc/usage.md
index 817d65e841..ef85525d94 100644
--- a/src/doc/usage.md
+++ b/src/doc/usage.md
@@ -35,7 +35,7 @@ A basic HTML5 Boilerplate site initially looks something like this:
 ├── doc
 ├── img
 ├── js
-│   ├── main.js
+│   ├── app.js
 │   ├── plugins.js
 │   └── vendor
 │       └── modernizr.min.js
diff --git a/src/index.html b/src/index.html
index 28dd0d2f6a..22b12135b0 100644
--- a/src/index.html
+++ b/src/index.html
@@ -28,7 +28,7 @@
   <p>Hello world! This is HTML5 Boilerplate.</p>
   <script src="js/vendor/modernizr-{{MODERNIZR_VERSION}}.min.js"></script>
   <script src="js/plugins.js"></script>
-  <script src="js/main.js"></script>
+  <script src="js/app.js"></script>
 
   <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
   <script>
diff --git a/src/js/main.js b/src/js/app.js
similarity index 100%
rename from src/js/main.js
rename to src/js/app.js
diff --git a/test/file_existence.js b/test/file_existence.js
index 1a1be844f0..74acfb0ab4 100644
--- a/test/file_existence.js
+++ b/test/file_existence.js
@@ -47,7 +47,7 @@ const expectedFilesInDistDir = [
   'index.html',
 
   'js/',
-  'js/main.js',
+  'js/app.js',
   'js/plugins.js',
   'js/vendor/',
   `js/vendor/modernizr-${pkg.devDependencies.modernizr}.min.js`,