Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. When size, weight, or other factors prevent sending an enclosure with a letter, send it separately and type "(sep cover)" after the enclosure's description.Assemble, number, and list each enclosure in the order mentioned in the letter in as few words as possible. Use common abbreviations. While a copy of an IEP must be provided to a parent, there is no regulatory requirement that an IEP must be an enclosure with or part of prior written notice. It's also ok to use the cover letter enclosure notation "Encl.:". Skip a line and then begin to list each of your enclosures. Choose a few phrases in the opening paragraph that let your reader know what to expect in the body of the letter.