In this article, we explain what an enclosure is and how to cite one, and we provide an example of an enclosure in a business letter. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl.A cover letter enclosure is a document you include with a physical cover letter, such as a resume or letter of recommendation. How to correctly format a business letter. Includes detailed instructions and example on how to write a business letter for any situation. Always include the enclosure at the end of the cover letter. A cover letter enclosure appears at the very end of your cover letter and refers to any additional documents that you've attached to your job application. If you are enclosing materials with your business letter, you'll need an enclosure notiation. Learn more with our enclosure letter sample. The document provides a sample business letter format with enclosure that can be used as a template for professional correspondence.