An enclosure in a cover letter is an annotation placed after your cover letter closing. It references any additional documents you’ve included in your application, such as your resume, letters of recommendation, or any written tests associated with the job application.
The standard way to include a cover letter enclosure is to write the word “Enclosure:” (or “Enclosures:” if you have multiple documents) after your signature. Then, list any additional documents in your application. For example, here’s a standard cover letter enclosure:
Letter of Recommendation