EPA issued a final rule in the Federal Register of May 16, 2016 for 55 chemical substances that were the subject of premanufacture notices (PMNs). For the chemical substance identified generically as aluminum calcium oxide salt (PMN P-15-328), EPA inadvertently omitted the de minimus exemption from the worker protection requirements. Also for the same chemical substance, a typographical error has been identified within the hazard communication program requirements. This document corrects the omission and the typographical error.