diff --git a/booking.emails_admin.inc b/booking.emails_admin.inc
index 9765558..5d0432c 100644
--- a/booking.emails_admin.inc
+++ b/booking.emails_admin.inc
@@ -294,6 +294,12 @@ function booking_emails_custom_ajax_form($node, &$form_state) {
     $form_format = NULL;
   }  
 
+  //include the token definitions
+  $form['tokens'] = array(
+    '#theme' => 'token_tree',
+    '#token_types' => array('booking'),
+  );  
+
   $form['email-type'] = array(
     '#type' => 'select',
     '#title' => t('Email Type'),