postscript (n.)

• addendum
• affix
• afterthought
• appendix
• chorus
• coda
• codicil
• colophon
• commentary
• conclusion
• consequence
• continuance
• continuation
• envoi
• epilogue
• follow-through
• follow-up
• infix
• interpolation
• marginalia
• note
• peroration
• postfix
• postlude
• prefix
• refrain
• rider
• scholia
• sequel
• sequela
• sequitur
• subscript
• suffix
• supplement
• tag
• tail