diff -u b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsDefaultFormatter.php b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsDefaultFormatter.php
--- b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsDefaultFormatter.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsDefaultFormatter.php
@@ -30,7 +30,7 @@
 class OptionsDefaultFormatter extends FormatterBase {
 
   /**
-   * Implements \Drupal\field\Plugin\Type\Formatter\FormatterInterface::viewElements().
+   * {@inheritdoc}
    */
   public function viewElements(EntityInterface $entity, $langcode, array $items) {
     $elements = array();
diff -u b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsKeyFormatter.php b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsKeyFormatter.php
--- b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsKeyFormatter.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/field/formatter/OptionsKeyFormatter.php
@@ -30,7 +30,7 @@
 class OptionsKeyFormatter extends FormatterBase {
 
   /**
-   * Implements \Drupal\field\Plugin\Type\Formatter\FormatterInterface::viewElements().
+   * {@inheritdoc}
    */
   public function viewElements(EntityInterface $entity, $langcode, array $items) {
     $elements = array();