Amazon announced Wednesday night that it will give over half a million of its workers a raise but maintain its $15 per hour minimum wage.

The e-commerce giant plans to hike pay starting in mid-May by between 50 cents to $3 an hour as part of an effort to hire more people into its customer fulfillment, delivery, package sorting and specialty fulfillment teams.

The raises will cost over $1 billion in incremental pay, Amazon executive Darcie Henry said in a blog post.

“This is on top of our already industry-leading starting wage of at least $15 an hour and the more than $2.5 billion that we invested last year in additional bonuses and incentives for front-line teams,” Henry wrote.