supplementary
adjective
[ ˌsʌplɪˈmɛnt(ə)ri ]
• completing or enhancing something.
• "the programme offers supplementary information about the news"
Similar:
additional,
extra,
supplemental,
increased,
further,
more,
add-on,
complementary,
subsidiary,
accessory,
auxiliary,
ancillary,
supportive,
reserve,
appended,
attached,
added,
accompanying,
annexed,
adjunct,
supplementary
noun
• a supplementary person or thing.