diff --git a/modules/promotion/src/Entity/Promotion.php b/modules/promotion/src/Entity/Promotion.php
index 2756dc9ccb..861cb76884 100644
--- a/modules/promotion/src/Entity/Promotion.php
+++ b/modules/promotion/src/Entity/Promotion.php
@@ -75,6 +75,21 @@ public function setName($name) {
     return $this;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return $this->get('description')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setDescription($description) {
+    $this->set('description', $description);
+    return $this;
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -240,6 +255,21 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDisplayConfigurable('view', TRUE)
       ->setDisplayConfigurable('form', TRUE);
 
+    $fields['description'] = BaseFieldDefinition::create('string_long')
+      ->setLabel(t('Description'))
+      ->setDescription(t('Additional information about the promotion to show to the customer'))
+      ->setTranslatable(TRUE)
+      ->setDefaultValue('')
+      ->setDisplayOptions('form', [
+        'type' => 'string_textarea',
+        'weight' => 1,
+        'settings' => [
+          'rows' => 3,
+        ],
+      ])
+      ->setDisplayConfigurable('view', TRUE)
+      ->setDisplayConfigurable('form', TRUE);
+
     $fields['order_types'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('Order types'))
       ->setDescription(t('The order types for which the promotion is valid.'))
diff --git a/modules/promotion/src/Entity/PromotionInterface.php b/modules/promotion/src/Entity/PromotionInterface.php
index 103185a951..d662b08340 100644
--- a/modules/promotion/src/Entity/PromotionInterface.php
+++ b/modules/promotion/src/Entity/PromotionInterface.php
@@ -28,6 +28,24 @@ public function getName();
    */
   public function setName($name);
 
+  /**
+   * Gets the promotion description.
+   *
+   * @return string
+   *    The promotion description.
+   */
+  public function getDescription();
+
+  /**
+   * Sets the promotion description.
+   *
+   * @param string $description
+   *   The promotion description.
+   *
+   * @return $this
+   */
+  public function setDescription($description);
+
   /**
    * Gets the promotion order types.
    *