diff --git a/composer.json b/composer.json
index e02dcb9..727e031 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
         "wikimedia/composer-merge-plugin": "~1.3"
     },
     "replace": {
-        "drupal/core": "~8.0"
+        "drupal/core": "~8.2"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,
diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index 5d1588d..ba1d469 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -80,6 +80,9 @@ class Drupal {
 
   /**
    * The current system version.
+   *
+   * This should be kept in sync with the drupal/core version in the root
+   * composer.json.
    */
   const VERSION = '8.2.0-dev';