VMS Help CMS, MODIFY, ELEMENT, Qualifiers, /HISTORY="string"  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Establishes the history attribute for the element. If an element
    has a history attribute, its history (which is similar to that
    produced by the ANNOTATE command) is included in the file when you
    retrieve it with the FETCH or RESERVE command.

    The quoted string specifies the format of the history. The quoted
    string must contain the characters #H or #B (lowercase is allowed)
    and can contain other printing characters. To include a quotation
    mark in the output history string, type it twice (""). To include
    a number sign (#) in the output history string, type it twice
    (##).