Supplementary
Completing or enhancing something.
Something additional; an extra.
Wikipedia
Additional (adjective)
Supplemental or added to something.
Additional (noun)
Something added.
Supplementary (adjective)
Additional; added to supply what is wanted.
Supplementary (noun)
Something additional; an extra.
Wiktionary
Supplementary (adjective)
completing or enhancing something
“the development of databases supplementary to existing ones”
“the programme offers supplementary information about the news”
Supplementary (noun)
a supplementary person or thing.
Supplementary (noun)
a question asked in parliament following the answer to a tabled one.
Oxford Dictionary
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