Increase yearly mileage?

i recently leased a lexus nx at 12k per year, after some initial calculations I realized that I probably want to increase it to 15k if I want to use it during the weekend rather than pure mon-fri commute. Is it a bad idea to increase the yearly allowed mileage? Anything I should watch out for? Thanks!

Once you sign the contract, there is no way to increase it. You’ll have to pay the overage fees.