You can add documentation on the History tab of a rule form to indicate how this record is used by other application users.
Open the rule form and click the History tab.
In the Description field of the Documentation section, enter text that describes the purpose of this record. For class rules, you cannot leave this field blank.
In the Usage field, enter text that provides guidance to users of this rule. For example, provide design-time instructions or special run-time considerations.
For deprecated rules, this field displays warning messages to other users. As a best practice, describe why the rule is deprecated and provide at least one migration path or alternative.