Fix behat composer install comment

stepup/README.md

@@ -117,7 +117,7 @@ STEPUP_VERSION=test
 3. Choose if you want to run the containers in the back- or foreground.
 
 3: Once the containers are up and running, you can run the behat tests
-1. Install the required dependencies in the container `$ docker compose exec composer install`
+1. Install the required dependencies in the container `$ docker compose exec behat composer install`
 2. Open a shell in the `behat` container `$ docker compose exec behat bash`
 3. Run the tests:
    1. `./behat` will run all available behat tests that are not excluded using the `@SKIP` tag