added

added
ad‧ded /ˈædəd, ˈædɪd/ adjectivein addition to what is usual or expected
   SYN  extra:
    cereal with added vitamins
    no added sugar
    added advantage/bonus/benefit etc
    The system has the added advantage of recordable DVD drives.
    Include people in your picture for added interest.
    added difficulty/problem etc
    Our yard is only small, and has the added disadvantage of facing north.
    It may not be necessary to go to the added expense of updating your anti-virus software.
     

THESAURUS

   ▪ extra in addition to the usual or standard cost, time, amount etc: They let the kids stay up an extra hour. | Some stores charge extra for delivery. | Postage is extra.
   ▪ additional [only before noun] more than the basic amount or the amount that you expected or agreed. Additional is more formal than extra: An evening job would provide additional income. | There may be an additonal charge for paying bills by credit card.
   ▪ added [only before noun ] extra – used when talking about something that makes something better or more effective: an added benefit | an added precaution | It was a beautiful place, and the good weather was an added bonus. | Use a sunscreen for added protection.
   ▪ spare [only before noun] kept in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etc: a spare key | a spare tyre | a spare set of clothes