Daily Chinese Idiom Guessing Game
To add something beautiful to something already beautiful; to make something good even better.
锦有彩色花纹的丝织品。在锦上再绣花。比喻好上加好，美上添美。
宋·王安石《即事》诗嘉招欲覆杯中渌，丙方唱仍添锦上花。”宋·黄庭坚《了了庵颂》又要涪翁作颂，且图锦上添花。”
Winning the championship was great, but getting a bonus was the icing on the cake.