The first notice must set for the proposed rule in the federal register. 2. The first notice must also include a reference to the legal authority under which the rule is proposed. 3. The first notice must also include an invitation to comment. This is a statement of the time, place, and nature of the public rulemaking proceeding. 4. And a citation to any known data (research/studies) that the agency is relying on to support the rule and information on how to access that data.