YSK always put the word "attached" in an email when you are going to put an attachment because if you forget to put an attachment, most email applications will remind you to attach it.
from /r/YouShouldKnow
YSK在準備放附件的時候,總是在郵件中寫上 "附件 "二字,因爲如果你忘記放附件,大多數電子郵件應用程序會提醒你放附件。