diff -u b/sites/default/default.settings.php b/sites/default/default.settings.php
--- b/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -556,8 +556,6 @@
  * By default, the active configuration is stored in the database in the
  * {config} table. To use a different storage mechanism for the active
  * configuration, do the following prior to installing:
- * - Create a folder for the active directory and define the path in
- *   $config_directories with the array key CONFIG_ACTIVE_DIRECTORY.
  * - Override the 'bootstrap_config_storage' setting here. It must be set to a
  *   callable that returns an object that implements
  *   \Drupal\Core\Config\StorageInterface.
@@ -582,6 +580,8 @@
  * By default, the active configuration is stored in the database in the
  * {config} table. To use a different storage mechanism for the active
  * configuration, do the following prior to installing:
+ * - Create a folder for the active directory and define the path in
+ *   $config_directories with the array key 'active'.
  * - Override the 'bootstrap_config_storage' setting here. It must be set to a
  *   callable that returns an object that implements
  *   \Drupal\Core\Config\StorageInterface.