NIST announces the release of an errata update for Special Publication 800-171, Revision 1, Protecting Controlled Unclassified Information is Nonfederal Systems and Organizations. The errata update includes minor changes to the publication that are either editorial or corrective in nature. NIST is also releasing the initial public draft of Special Publication 800-171A, Assessing Security Requirements for Controlled Unclassified Information. This companion publication is intended to help organizations develop assessment plans and conduct assessments to help determine compliance to the security requirements in NIST Special Publication 800-171