diff --git a/packages/app/src/App.test.tsx b/packages/app/src/App.test.tsx
index 0074416375..ace8f42f45 100644
--- a/packages/app/src/App.test.tsx
+++ b/packages/app/src/App.test.tsx
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import React from 'react';
 import { render } from '@testing-library/react';
 import App from './App';
diff --git a/packages/app/src/App.tsx b/packages/app/src/App.tsx
index 484ae671ec..cb4c4470ba 100644
--- a/packages/app/src/App.tsx
+++ b/packages/app/src/App.tsx
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import { CssBaseline, makeStyles, ThemeProvider } from '@material-ui/core';
 import { BackstageTheme, createApp } from '@spotify-backstage/core';
 import React, { FC } from 'react';
diff --git a/packages/app/src/components/Root/Root.tsx b/packages/app/src/components/Root/Root.tsx
index 07f4a1092f..af7759d86f 100644
--- a/packages/app/src/components/Root/Root.tsx
+++ b/packages/app/src/components/Root/Root.tsx
@@ -1,3 +1,21 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import React, { FC, useContext } from 'react';
+import PropTypes from 'prop-types';
 import { Link, makeStyles, Typography } from '@material-ui/core';
 import HomeIcon from '@material-ui/icons/Home';
 import {
@@ -10,7 +28,6 @@ import {
   SidebarDivider,
   SidebarSpace,
 } from '@spotify-backstage/core';
-import React, { FC, useContext } from 'react';
 
 const useSidebarLogoStyles = makeStyles({
   root: {
@@ -67,4 +84,8 @@ const Root: FC<{}> = ({ children }) => (
   </SidebarPage>
 );
 
+Root.propTypes = {
+  children: PropTypes.node,
+};
+
 export default Root;
diff --git a/packages/app/src/components/Root/index.ts b/packages/app/src/components/Root/index.ts
index 7ee9fa90d7..e997e09c18 100644
--- a/packages/app/src/components/Root/index.ts
+++ b/packages/app/src/components/Root/index.ts
@@ -1 +1,17 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 export { default } from './Root';
diff --git a/packages/app/src/index.tsx b/packages/app/src/index.tsx
index b597a44232..2ea8d3f1dd 100644
--- a/packages/app/src/index.tsx
+++ b/packages/app/src/index.tsx
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import React from 'react';
 import ReactDOM from 'react-dom';
 import App from './App';
diff --git a/packages/app/src/plugins.ts b/packages/app/src/plugins.ts
index 994c986533..486452b956 100644
--- a/packages/app/src/plugins.ts
+++ b/packages/app/src/plugins.ts
@@ -1,2 +1,18 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 export { default as HomePagePlugin } from '@spotify-backstage/plugin-home-page';
 export { default as WelcomePlugin } from '@spotify-backstage/plugin-welcome';
diff --git a/packages/app/src/react-app-env.d.ts b/packages/app/src/react-app-env.d.ts
index 6431bc5fc6..f4145f20db 100644
--- a/packages/app/src/react-app-env.d.ts
+++ b/packages/app/src/react-app-env.d.ts
@@ -1 +1,17 @@
-/// <reference types="react-scripts" />
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
diff --git a/packages/app/src/setupTests.ts b/packages/app/src/setupTests.ts
index 74b1a275a0..e206a945cc 100644
--- a/packages/app/src/setupTests.ts
+++ b/packages/app/src/setupTests.ts
@@ -1,4 +1,20 @@
-// jest-dom adds custom jest matchers for asserting on DOM nodes.
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
 // allows you to do things like:
 // expect(element).toHaveTextContent(/react/i)
 // learn more: https://github.com/testing-library/jest-dom