diff --git a/docs/radix-4.md b/docs/radix-4.md
index c2ed2e9..20031b4 100644
--- a/docs/radix-4.md
+++ b/docs/radix-4.md
@@ -1,5 +1,5 @@
 # Radix 4.x
-Documentation for Radix 4.x theme for Drupal 8.
+Documentation for Radix 4.x theme for Drupal 8 and 9.
 
 ## Requirements
 
@@ -7,6 +7,21 @@ Documentation for Radix 4.x theme for Drupal 8.
 2. [Drush 8](http://drush.org) - [Read a guide on how to install Drush here](http://www.drush.org/en/master/install/).
 3. [Components module](https://www.drupal.org/project/components)
 
+## Quick start for Drupal 9 (with Drush 10)
+
+1. Download and enable components 2.x: `composer require 'drupal/components:^2.0@beta'; drush en components -y`
+2. Download and enable radix: `composer require 'drupal/radix'; drush theme:enable radix -y`
+3. Clear caches: `drush cache-rebuild`
+4. Create a subtheme: `drush --include=themes/contrib/radix radix:create SUBTHEME_NAME`
+5. Enable the new theme: `drush theme:enable SUBTHEME_NAME -y`
+6. Make it the default: `drush config-set system.theme default SUBTHEME_NAME -y`
+7. Install required node modules: `cd themes/custom/SUBTHEME_NAME; npm install;`
+8. Update the proxy URL in `themes/custom/SUBTHEME_NAME/webpack.mix.js`
+9. Compile theme for development: `npm run dev`
+10. Auto-compile changes: `npm run watch`
+
+If drush reports 'There are no commands defined in the "radix" namespace.' for the `radix:create` command, then make sure you are running drush from the web root (i.e. the directory from which the inclue path `themes/contrib/radix` is valid).
+
 ## Quick start for Drupal 8
 
 1. Download and enable radix: `composer require drupal/radix; drush en components radix -y`.