diff --git a/lib/Entities/NewsletterEntity.php b/lib/Entities/NewsletterEntity.php
index 9d63f05e69..6432b3231f 100644
--- a/lib/Entities/NewsletterEntity.php
+++ b/lib/Entities/NewsletterEntity.php
@@ -23,6 +23,7 @@ class NewsletterEntity {
   const TYPE_WELCOME = 'welcome';
   const TYPE_NOTIFICATION = 'notification';
   const TYPE_NOTIFICATION_HISTORY = 'notification_history';
+  const TYPE_WC_TRANSACTIONAL_EMAIL = 'wc_transactional';
 
   // standard newsletters
   const STATUS_DRAFT = 'draft';
diff --git a/lib/Models/Newsletter.php b/lib/Models/Newsletter.php
index 37095774ef..a3f052bbb1 100644
--- a/lib/Models/Newsletter.php
+++ b/lib/Models/Newsletter.php
@@ -41,6 +41,7 @@ class Newsletter extends Model {
   const TYPE_WELCOME = NewsletterEntity::TYPE_WELCOME;
   const TYPE_NOTIFICATION = NewsletterEntity::TYPE_NOTIFICATION;
   const TYPE_NOTIFICATION_HISTORY = NewsletterEntity::TYPE_NOTIFICATION_HISTORY;
+  const TYPE_WC_TRANSACTIONAL_EMAIL = NewsletterEntity::TYPE_WC_TRANSACTIONAL_EMAIL;
   // standard newsletters
   const STATUS_DRAFT = NewsletterEntity::STATUS_DRAFT;
   const STATUS_SCHEDULED = NewsletterEntity::STATUS_SCHEDULED;