diff --git a/README.md b/README.md
index c428695..1492613 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,6 @@ THESE INSTRUCTIONS ARE FOR DRUSH 9 of DRUSH 8.2+. If you are using an earlier ve
 
 If you are managing your Drupal site with Composer, then add the Behat Drush Endpoint to your project as follows:
 ```bash
-composer require drush-ops/behat-drush-endpoint:^9
+composer require --dev drush-ops/behat-drush-endpoint:^9
 ```
 If you are not using composer.json on the remote Drupal site, then copy the entire contents of this project to either **__ROOT__**/drush or **__ROOT__**/sites/all/drush, then `cd behat-drush-endpoint` and run `composer install`.