supplement
nounUK /ˈsʌplɪmənt/
US /ˈsʌpləmənt/
Something you add to make something else better or bigger.
She takes a vitamin supplement every morning.
OTHER MEANINGS
2. An extra part added to a book or newspaper.
The magazine comes with a free supplement about travel.
3. To add something extra to improve or complete it.
He supplements his income by teaching piano on weekends.
4. An extra section added to a document to give more information.
Please read the supplement at the end of the report.