AUGUSTA — Democratic Gov. Janet Mills signed off Tuesday on a $15 million state borrowing package that was approved by voters more than three years ago and meant to bolster the state’s stock of affordable housing for senior citizens.

The bonding package was approved by voters in November 2015. Mills’ predecessor, Republican Gov. Paul LePage, refused to authorize the sale of the bonds, saying they were going to make a few people millionaires overnight, although LePage provided no proof of that. The bond sale will now go forward in June.

Mills said $500,000 would be made immediately available to help fund ongoing home repair and weatherization projects aimed at helping keep older Mainers living in their own homes safely and comfortably.