diff --git a/core/lib/Drupal/Core/Entity/Plugin/EntityReferenceSelection/DefaultSelection.php b/core/lib/Drupal/Core/Entity/Plugin/EntityReferenceSelection/DefaultSelection.php
index 218131c..5a6f294 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/EntityReferenceSelection/DefaultSelection.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/EntityReferenceSelection/DefaultSelection.php
@@ -145,6 +145,7 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
       $form['sort']['field'] = [
         '#type' => 'select',
         '#title' => $this->t('Sort by'),
+        '#description' => $this->t('Select a field to be used when sorting entities available to be refrenced.'),
         '#options' => [
           '_none' => $this->t('- None -'),
         ] + $fields,