diff --git a/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php b/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
index 1f1aa6b..85bf607 100644
--- a/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
+++ b/core/modules/image/src/Plugin/Field/FieldType/ImageItem.php
@@ -262,7 +262,7 @@ public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
       '#type' => 'checkbox',
       '#title' => t('Enable <em>Alt</em> field'),
       '#default_value' => $settings['alt_field'],
-      '#description' => t('The alt attribute may be used by search engines, screen readers, and when the image cannot be loaded. Enabling this field is recommended'),
+      '#description' => t('The alt attribute may be used by search engines, screen readers, and when the image cannot be loaded. Enabling this field is recommended.'),
       '#weight' => 9,
     );
     $element['alt_field_required'] = array(