An explanation letter is a brief document that provides a reason or clarification for a particular situation or action. It is used to help others understand the details or background of something that may be confusing or unclear. Full definition
Always keep your resignation explanation letter brief and to the point. (template.net)
Download a free explanation letter sample, then edit to suit your needs. (officewriting.com)
Examples of conditions may include explanation letters, copies of financial documents, divorce papers, or any number of items that will clarify your qualifications for the loan. (bigvalleymortgage.com)