How To Write Enclosure In Letter . An enclosure in a cover letter is a list of any additional documents you’ve included in your application. Type “enclosure” two lines below your name and signature. FREE 6+ Enclosure Cover Letter Templates in MS Word PDF from www.sampletemplates.com The enclosure notation occurs after the closing and signature. After your enclosure section, type the notation cc followed by a colon. After the subject line start your letter with a proper and formal salutation.