diff --git a/web/modules/custom/yufu_concept/yufu_concept.module b/web/modules/custom/yufu_concept/yufu_concept.module
index 70c7b22..32304d1 100644
--- a/web/modules/custom/yufu_concept/yufu_concept.module
+++ b/web/modules/custom/yufu_concept/yufu_concept.module
@@ -7,6 +7,8 @@
 
 /**
  * Implements hook_mail().
+ *
+ * @TODO this should go into hook presave.
  */
 function yufu_concept_mail($key, &$message, $params) {
   $options = [