Make Installation of site-package more clear (#220)

Resolves #206
Releases: main, 13.4

Author: linawolf

Documentation/MinimalExample/Index.rst

@@ -83,8 +83,13 @@ After you have created your site package extension you can uninstall :composer:`
     ddev composer remove b13/make --dev
 
 Before your brand new site package extension takes effect in your TYPO3
-installation, you have to install it.
-See chapter :ref:`Extension installation <t3sitepackage:extension-installation>`.
+installation, you have to install it:
+
+..  code-block:: bash
+
+    ddev composer req t3docs/site-package:"@dev"
+
+See also chapter :ref:`Extension installation <t3sitepackage:extension-installation>`.
 
 .. _minimal-extension-siteset: