supplement

US /ˈsʌp.lə.mənt/
UK /ˈsʌp.lə.mənt/
"supplement" picture
1.

something added to complete or enhance something else

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•
The vitamin C is a good supplement to your diet.
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The book includes a useful supplement on grammar.
:
additionextracomplementappendixaddendum
1.

add an extra element or amount to

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She decided to supplement her income by working part-time.
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The new data will supplement the existing research.
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add toaugmentenhancetop upfill out