(16)Regulation (EU) No 462/2013 introduces safeguards in Article 8(5a)(6) aa and ab and (7) of Regulation (EC) No 1060/2009 to ensure that any modification to rating methodologies does not result in less rigorous methodologies. The US legal and supervisory framework requires each NRSRO to establish, maintain, enforce, and document policies reasonably designed to ensure that material changes to the procedures and methodologies are promptly published on an easily accessible portion of the NRSRO's website. There is no specific obligation to correct an identified error in a methodology, but it follows from more general provisions regarding the quality of methodologies.