diff --git a/doc/notification.md b/doc/notification.md
index 314dd9d..b2f6ace 100644
--- a/doc/notification.md
+++ b/doc/notification.md
@@ -1,3 +1,5 @@
+# Notification Email
+
 GitBucket sends email to target users by enabling the notification email by an administrator.
 
 The timing of the notification are as follows: