锦上添花 (jǐn shàng tiān huā): [lit.] onto brocade (verb/idiom) — Meaning & Stroke Order

The signing of this cooperation agreement undoubtedly adds to the strategic alliance between both parties.

He works very hard, this promotion is just the icing on the cake.

Do you think adding charts to the report would enhance the overall presentation?

He does not consider the extra bonus as adding to perfection; instead, he feels it is a deserved return.