VMS Help CMS, REMARK, Qualifiers, /UNUSUAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies that the remark string placed in the history file be
    marked as an unusual occurrence, so that it appears marked with an
    asterisk in the output from SHOW HISTORY and is included in the
    output from a SHOW HISTORY/UNUSUAL command.