dopuna

1. addition; supplement; addendum
   Skupština je usvojila izmene i dopune zakona. — Parliament adopted amendments and additions to the law.
   Vitamini su dobra dopuna ishrani. — Vitamins are a good supplement to your diet.
2. (of a mobile phone) top-up
   Moram da kupim dopunu za telefon. — I need to buy a top-up for my phone.
   Dopunu možeš platiti na svakom kiosku. — You can pay for a top-up at any kiosk.

The set phrase "izmene i dopune" means amendments to a law or document.