What is the term used for notes that provide additional information but are not mandatory?

The term used for notes that provide additional information but are not mandatory is referred to as informational notes. These kinds of notes serve to clarify details, provide context, or enhance understanding without imposing any requirements or obligations. In many documents, especially in technical writing or codes, informational notes are crucial for helping the reader grasp the nuances and implications of the material without being part of the regulatory framework. They can assist in decision-making and interpretation but do not carry the weight of enforceable standards, which distinguishes them from mandatory notes or directives.

The other options represent different types of notes that usually serve more specific functions. Regulatory notes would typically outline requirements that must be followed, while clarifying notes would focus on expounding particular aspects or terminology. Directive notes imply a level of authority and mandate adherence to specific instructions. Thus, while all these notes serve important roles, it is the informational notes that specifically convey additional but non-mandatory information.