An enclosure in a cover letter is a list of any additional documents you’ve included in your application. Typical enclosure documents include letters of recommendation, certificates, and written tests associated with the job application.
Include a cover letter enclosure by writing “Enclosure:” (or “Enclosures:” if you have multiple documents) after your signature, and then listing all attached documents.
For example, here’s a standard cover letter enclosure:
Letter of Recommendation