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

       /LOG (default)
       /NOLOG

    Controls whether the system generates an informational message if
    the symbol value has been truncated. The value is truncated if it
    exceeds 255 characters.