VMS Help CMS, SET, ACL, Qualifiers, /AFTER=ace  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Indicates that all access control entries (ACEs) specified with
    the /ACL qualifier are added after the ACE specified with the
    /AFTER qualifier. By default, any ACEs added to the access control
    list (ACL) are always placed at the top of the list.