diff --git a/composer.json b/composer.json
index ee5a542..1f7c3dd 100644
--- a/composer.json
+++ b/composer.json
@@ -1,4 +1,10 @@
 {
+  "_readme": [
+    "This is an example file to show how a Drupal website can be managed via",
+    "Composer. It does not work out of the box but requires to add a Git",
+    "subtree split of the core directory to be added to the repositories"
+    "section below."
+  ],
   "name": "drupal/drupal",
   "description": "Drupal is an open source content management platform powering millions of websites and applications.",
   "type": "project",
@@ -8,6 +14,8 @@
   },
   "minimum-stability": "dev",
   "prefer-stable": true,
+  "repositories": {
+  },
   "config": {
     "preferred-install": "dist",
     "autoloader-suffix": "Drupal8"