#addendum__supplement__postscript  textual matter that is added onto a publication; usually at the end
  supertype:  matter  written works (especially in books or magazines); "he always took some reading matter with him on the plane"
  subtype:  appendix  sequel
  part of:  back_matter__end_matter__endmatter  written matter following the main text of a book

No statement uses or specializes addendum; click here to add one.