diff --git a/frontend/components/CenteredContent/CenteredContent.js b/frontend/components/CenteredContent/CenteredContent.js
index aacf7626..37ddf991 100644
--- a/frontend/components/CenteredContent/CenteredContent.js
+++ b/frontend/components/CenteredContent/CenteredContent.js
@@ -1,8 +1,13 @@
+// @flow
 import React from 'react';
-
 import styles from './CenteredContent.scss';
 
-const CenteredContent = props => {
+type Props = {
+  children: any,
+  style: Object,
+};
+
+const CenteredContent = (props: Props) => {
   const style = {
     maxWidth: props.maxWidth,
     ...props.style,
@@ -19,9 +24,4 @@ CenteredContent.defaultProps = {
   maxWidth: '740px',
 };
 
-CenteredContent.propTypes = {
-  children: React.PropTypes.node.isRequired,
-  style: React.PropTypes.object,
-};
-
 export default CenteredContent;
diff --git a/frontend/components/DocumentList/DocumentList.js b/frontend/components/DocumentList/DocumentList.js
index 34a83e03..e914711c 100644
--- a/frontend/components/DocumentList/DocumentList.js
+++ b/frontend/components/DocumentList/DocumentList.js
@@ -1,27 +1,24 @@
+// @flow
 import React from 'react';
-
+import type { Document } from '../../../types';
 import DocumentPreview from 'components/DocumentPreview';
 import Divider from 'components/Divider';
 
-import styles from './DocumentList.scss';
-
 class DocumentList extends React.Component {
-  static propTypes = {
-    documents: React.PropTypes.arrayOf(React.PropTypes.object),
+  props: {
+    documents: Array<Document>,
   };
 
   render() {
     return (
       <div>
         {this.props.documents &&
-          this.props.documents.map(document => {
-            return (
-              <div>
-                <DocumentPreview document={document} />
-                <Divider />
-              </div>
-            );
-          })}
+          this.props.documents.map(document => (
+            <div>
+              <DocumentPreview document={document} />
+              <Divider />
+            </div>
+          ))}
       </div>
     );
   }
diff --git a/frontend/components/SlackAuthLink/SlackAuthLink.js b/frontend/components/SlackAuthLink/SlackAuthLink.js
index 404633ba..9b6d8edb 100644
--- a/frontend/components/SlackAuthLink/SlackAuthLink.js
+++ b/frontend/components/SlackAuthLink/SlackAuthLink.js
@@ -1,14 +1,16 @@
+// @flow
 import React from 'react';
 import { observer, inject } from 'mobx-react';
+import type { User } from '../../../types';
 
 @inject('user')
 @observer
 class SlackAuthLink extends React.Component {
-  static propTypes = {
-    children: React.PropTypes.node.isRequired,
-    scopes: React.PropTypes.arrayOf(React.PropTypes.string),
-    user: React.PropTypes.object.isRequired,
-    redirectUri: React.PropTypes.string,
+  props: {
+    children: any,
+    scopes: Array<string>,
+    user: User,
+    redirectUri: string,
   };
 
   static defaultProps = {
diff --git a/frontend/utils/ApiClient.js b/frontend/utils/ApiClient.js
index 7fe48878..cff69215 100644
--- a/frontend/utils/ApiClient.js
+++ b/frontend/utils/ApiClient.js
@@ -1,8 +1,7 @@
 import _ from 'lodash';
 import { browserHistory } from 'react-router';
-import stores from 'stores';
-
 import constants from '../constants';
+import stores from 'stores';
 
 const isIterable = object =>
   object != null && typeof object[Symbol.iterator] === 'function';