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The Privacy Act requires each agency to publish a notice of its systems of records in the Federal Register. This is called a System of Record Notice (SORN).
NIST SP 800-79-2 under SORN
The notice(s) published by an agency in the Federal Register upon the establishment and/or modification of a system of records describing the existence and character of the system.
NIST SP 800-53 Rev. 5 from OMB Circular A-108