Meaning of “modify” - Learner’s Dictionary

modify

verb [ T ] uk us /ˈmɒdɪfaɪ/
CHANGE

to change something in order to improve it:

[ often passive ] The plans will have to be modified to reduce costs.
genetically modified food
GRAMMAR

In grammar, a word that modifies another word describes or limits the meaning of that word:

Adjectives modify nouns.

(Definition of “modify” from the Cambridge Learner’s Dictionary © Cambridge University Press)