"To add an incentive" means to offer something that motivates or encourages someone to act in a certain way or to achieve a particular goal. Full definition
In this way you provide your muscles with added incentive for new muscle growth. (fitnessandpower.com)
Show your new dog his / her place to sleep and place a few treats around the area as added incentives. (starelief.org)
These can delay or prevent people from signing up for retirement plans, even when tax advantageous and with added incentives such as company matching contributions. (blackrockblog.com)