/sys$common/syshlp/helplib.hlb RUNOFF, /INDEX, Qualifiers, /RESERVE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /RESERVE=n
       /NORESERVE (default)

    Allows you to reserve space at the top of the first page of the
    index for text or white space that you want to include with the
    /REQUIRE=filespec qualifier. Determine how many lines of text or
    white space you are adding to the top of the first page of the
    index. Use this number as the value n for the /RESERVE qualifier.