supplement

additive

addendum addition appendix bell codicil complement continuation extra insert option postscript pullout rider sequel spin-off subsidiary

added feature bells and whistles

base core

augment build up buttress complement enhance enrich fill out fortify improve reinforce strengthen subsidize

complete extend increase pad supply top

add fuel to fire beef up fill up heat up jazz up punch up step up

decrease discourage dissuade hurt injure let down reduce take away weaken worsen

lose lower

subtract