Download NIST SP 800-171 Revision 1
The National Institute of Standards and Technology (NIST) published an update to DFARS SP 800-171 documentation on June 7th, 2018 called SP 800-171 Rev.1.
According to NIST, “The errata update includes minor editorial changes to selected CUI security requirements, some additional references and definitions, and a new appendix that contains an expanded discussion about each CUI requirement.” These changes are outlined on “Errata” on pages 9 through 15″