diff --git a/core/lib/Drupal/Core/Composer/Composer.php b/core/lib/Drupal/Core/Composer/Composer.php
index cec08c9..52cbff4 100644
--- a/core/lib/Drupal/Core/Composer/Composer.php
+++ b/core/lib/Drupal/Core/Composer/Composer.php
@@ -125,6 +125,8 @@ public static function ensureHtaccess(Event $event) {
    * Remove possibly problematic test files from vendored projects.
    *
    * @param \Composer\Script\Event $event
+   * @param \Composer\Installer\PackageEvent $event
+   *  A script PackageEvent object from composer.
    */
   public static function vendorTestCodeCleanup(PackageEvent $event) {
     $vendor_dir = $event->getComposer()->getConfig()->get('vendor-dir');