diff --git a/core/lib/Drupal/Core/Form/FormBuilderInterface.php b/core/lib/Drupal/Core/Form/FormBuilderInterface.php
index 8252d7f..0311e81 100644
--- a/core/lib/Drupal/Core/Form/FormBuilderInterface.php
+++ b/core/lib/Drupal/Core/Form/FormBuilderInterface.php
@@ -114,9 +114,10 @@ public function getForm($form_arg);
    *     already set $form_state['rebuild'] to cause the form processing to
    *     bypass submit handlers and rebuild the form instead, even if there are
    *     no validation errors.
-   *   - response: Used when a form needs to return some kind of response, eg
-   *     a \Symfony\Component\HttpFoundation\BinaryFileResponse when triggering
-   *     a file download. If you need to use a
+   *   - response: Used when a form needs to return some kind of a
+   *     \Symfony\Component\HttpFoundation\Response object, eg a
+   *     \Symfony\Component\HttpFoundation\BinaryFileResponse when triggering a
+   *     file download. If you need to use a
    *     \Symfony\Component\HttpFoundation\RedirectResponse please use the
    *     redirect key instead.
    *   - redirect: Used to redirect the form on submission. It may either be a