diff --git a/core/lib/Drupal/Core/Form/FormBuilderInterface.php b/core/lib/Drupal/Core/Form/FormBuilderInterface.php
index 334e10b..55d579b 100644
--- a/core/lib/Drupal/Core/Form/FormBuilderInterface.php
+++ b/core/lib/Drupal/Core/Form/FormBuilderInterface.php
@@ -170,13 +170,12 @@ public function rebuildForm($form_id, FormStateInterface &$form_state, $old_form
    * For example:
    * @code
    * // register a new user
-   * $form_state = new FormState();
    * $values['name'] = 'robo-user';
    * $values['mail'] = 'robouser@example.com';
    * $values['pass']['pass1'] = 'password';
    * $values['pass']['pass2'] = 'password';
    * $values['op'] = t('Create new account');
-   * $form_state->setValues($values);
+   * $form_state = (new FormState())->setValues($values);
    * \Drupal::formBuilder()->submitForm('user_register_form', $form_state);
    * @endcode
    */