PS
Parthian shot
addendum
affix
afterthought
allonge
appendix
attested copy
back matter
bequeathal
bequest
chorus
coda
colophon
commentary
conclusion
consequence
continuance
continuation
devise
double take
dying words
enclitic
envoi
epilogue
follow-through
follow-up
infix
inheritance
interlineation
interpolation
last words
legacy
marginalia
note
parting shot
peroration
postface
postfix
postlude
postscript
prefix
probate
proclitic
refrain
rider
scholia
second thought
sequel
sequela
dicing
perm