diff --git a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
index 20c4cfa..b09a67b 100644
--- a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
@@ -108,6 +108,8 @@ protected function doScanExtensions() {
     $profiles = $profile_extension_discovery->scan('profile');
     // Modify the active profile object that was previously added to the module
     // list.
+    // @todo Replace drupal_get_profile() once
+    //   https://www.drupal.org/node/2156401 is in.
     $active_profile_name = drupal_get_profile();
     if ($active_profile_name && isset($profiles[$active_profile_name])) {
       $extensions[$active_profile_name] = $active_profile = $profiles[$active_profile_name];