There are several synonyms for the phrase "minor modification". Some of the alternatives include "small adjustment", "slight alteration", "tweak", "fine-tuning", "refinement", "modification on a small scale", "narrow update" and "minor tweak". These phrases convey a similar message to the original phrase, which refers to a change that is not significant in scope but nonetheless impacts the outcome. In the context of product development or software engineering, for example, a minor modification may involve fixing a bug or updating a feature while retaining the majority of the existing design or functionality. Choosing the right synonym for the task at hand can help you convey your message more precisely and effectively.