A change to one of the following types of rules may be made only as shown below. Type of rule: Racing rule - Change only if permitted by Rule 86. Rule in a World Sailing code - Change only if permitted by A rule in the code. National authority prescription - Change only if permitted by Rule 88.2. Class rule - Change only if permitted by Rule 87. Rule in the notice of race - Change only if permitted by Rule 89.2(b). Rule in the sailing instructions - Change only if permitted by Rule 90.2(c). Rule in any other document governing the event - Change only if permitted by A rule in the document itself.