Examples of enclosures in business letters. Citing enclosures can be easier if you can follow examples.There are no set rules for what can be enclosed with your letter. However, only send what is essential to your purpose. Sign in black or blue ink above your typed name. Enclosure Line—The enclosure notation refers to the résumé. 1. In the sample letter, fill in your personal information. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. This letter serves to document my patient's medical history and diagnosis and to summarize my treatment rationale.