ANSI Common Lisp 1 Introduction 1.4 Definitions 1.4.4 Interpreting Dictionary Entries
18.104.22.168 The "Notes" Section of a Dictionary Entry
Information not found elsewhere in this description
which pertains to this operator.
Among other things, this might include
cross reference information,
This information is not considered part of the standard;
any conforming implementation or conforming program
is permitted to ignore the presence of this information.