28 C.F.R. § 802.5
(a) Submission, processing, and release procedures.
(b) Description of records sought. You must describe the records that you seek in enough detail to enable Agency personnel to locate them with a reasonable amount of effort. Whenever possible, your request should include specific information about each record sought, such as the date, title or name, author, recipient and subject matter of the record. As a general rule, the more specific you are about the records or type of records that you want, the more likely the Agency will be able to locate the records in response to your request. If a determination is made that your request does not reasonably describe records, the Agency will tell you either what additional information is needed or why your request is otherwise insufficient. You will be given the opportunity to discuss your request so that you may modify it to meet the requirements of this section.