diff --git a/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
index 39f4348..3873691 100644
--- a/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
+++ b/core/lib/Drupal/Core/Config/ExtensionInstallStorage.php
@@ -8,7 +8,7 @@
 namespace Drupal\Core\Config;
 
 /**
- * Storage controller to access configuration and schema in enabled extensions.
+ * Storage to access configuration and schema in enabled extensions.
  *
  * @see \Drupal\Core\Config\ConfigInstaller
  * @see \Drupal\Core\Config\TypedConfigManager
@@ -28,13 +28,13 @@ class ExtensionInstallStorage extends InstallStorage {
    * @param \Drupal\Core\Config\StorageInterface $config_storage
    *   The active configuration store where the list of enabled modules and
    *   themes is stored.
-   * @param string $collection
+   * @param string $directory
    *   The folder to scan in each extension to scan for files. Defaults to
    *   'config'.
    */
-  public function __construct(StorageInterface $config_storage, $collection = 'config') {
+  public function __construct(StorageInterface $config_storage, $directory = 'config') {
     $this->configStorage = $config_storage;
-    $this->collection = $collection;
+    $this->directory = $directory;
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Config/InstallStorage.php b/core/lib/Drupal/Core/Config/InstallStorage.php
index da9e57d..ff3005a 100644
--- a/core/lib/Drupal/Core/Config/InstallStorage.php
+++ b/core/lib/Drupal/Core/Config/InstallStorage.php
@@ -34,17 +34,17 @@ class InstallStorage extends FileStorage {
    *
    * @var string
    */
-  protected $collection;
+  protected $directory;
 
   /**
-   * Overrides Drupal\Core\Config\FileStorage::__construct().
+   * Constructs an InstallStorage object.
    *
-   * @param string $collection
+   * @param string $directory
    *   The folder to scan in each extension to scan for files. Defaults to
    *   'config'.
    */
-  public function __construct($collection = 'config') {
-    $this->collection = $collection;
+  public function __construct($directory = 'config') {
+    $this->directory = $directory;
   }
 
   /**
@@ -77,7 +77,7 @@ public function getFilePath($name) {
   }
 
   /**
-   * Implements \Drupal\Core\Config\StorageInterface::exists().
+   * {@inheritdoc}
    */
   public function exists($name) {
     return array_key_exists($name, $this->getAllFolders());
@@ -188,7 +188,7 @@ public function getComponentNames($type, array $list) {
    *   The configuration folder name for this component.
    */
   protected function getComponentFolder($type, $name) {
-    return drupal_get_path($type, $name) . '/' . $this->collection;
+    return drupal_get_path($type, $name) . '/' . $this->directory;
   }
 
   /**