diff --git a/core/lib/Drupal/Core/Extension/ExtensionList.php b/core/lib/Drupal/Core/Extension/ExtensionList.php
index d36f384..bf60c89 100644
--- a/core/lib/Drupal/Core/Extension/ExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ExtensionList.php
@@ -16,7 +16,7 @@
 abstract class ExtensionList {
 
   /**
-   * The type of the extension, either module or theme.
+   * The type of the extension, either 'module' or 'theme'.
    *
    * @var string
    */
@@ -160,7 +160,7 @@ public function listExtensions() {
    * Scans the available extensions.
    *
    * Overriding this method gives other code the chance to add additional
-   * entries to this raw listing.
+   * extensions to this raw listing.
    *
    * @param \Drupal\Core\Extension\ExtensionDiscovery $discovery
    *   The extension discovery.
diff --git a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
index 02981aa..c6461d8 100644
--- a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
@@ -104,8 +104,8 @@ protected function doListExtensions() {
     }
 
     if ($profile = drupal_get_profile()) {
-      // Installation profiles are hidden by default, unless explicitly specified
-      // otherwise in the .info.yml file.
+      // Installation profiles are hidden by default, unless explicitly
+      // specified otherwise in the .info.yml file.
       if (!isset($extensions[$profile]->info['hidden'])) {
         $extensions[$profile]->info['hidden'] = TRUE;
       }