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supplementary

In a sentence
Hotel ponúka doplnkové služby.
The hotel offers additional services.
Doplnkový kurz angličtiny začína v pondelok.
The supplementary English course starts on Monday.
Hotel ponúka doplnkové služby za poplatok.
The hotel offers complementary services for a fee.
Doplnkový materiál k učebnici nájdete online.
You will find supplementary material for the textbook online.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.