diff --git a/README.md b/README.md
index d4932874..a7621aa6 100644
--- a/README.md
+++ b/README.md
@@ -127,6 +127,9 @@ For a good example, see https://riot.im/develop/config.json
    release to release.
 1. `brand`: String to pass to your homeserver when configuring email notifications, to let the
    homeserver know what email template to use when talking to you.
+1. `branding`: Configures various branding and logo details, such as:
+    1. `welcomeBackgroundUrl`: An image to use as a wallpaper outside the app
+       during authentication flows
 1. `integrations_ui_url`: URL to the web interface for the integrations server. The integrations
    server is not Riot and normally not your homeserver either. The integration server settings
    may be left blank to disable integrations.
diff --git a/src/components/views/auth/VectorAuthPage.js b/src/components/views/auth/VectorAuthPage.js
index 0fc42f0a..bae685b9 100644
--- a/src/components/views/auth/VectorAuthPage.js
+++ b/src/components/views/auth/VectorAuthPage.js
@@ -18,6 +18,7 @@ limitations under the License.
 
 import React from 'react';
 import sdk from 'matrix-react-sdk/lib/index';
+import SdkConfig from 'matrix-react-sdk/lib/SdkConfig';
 
 export default class VectorAuthPage extends React.PureComponent {
     static replaces = 'AuthPage'
@@ -25,8 +26,14 @@ export default class VectorAuthPage extends React.PureComponent {
     render() {
         const AuthFooter = sdk.getComponent('auth.AuthFooter');
 
+        const brandingConfig = SdkConfig.get().branding;
+        let backgroundUrl = "themes/riot/img/backgrounds/valley.jpg";
+        if (brandingConfig && brandingConfig.welcomeBackgroundUrl) {
+            backgroundUrl = brandingConfig.welcomeBackgroundUrl;
+        }
+
         const pageStyle = {
-            background: 'center/cover fixed url(themes/riot/img/backgrounds/valley.jpg)',
+            background: `center/cover fixed url(${backgroundUrl})`,
         };
 
         const modalStyle = {