Monday marks Black Women’s Equal Pay Day, which shows how many days into 2017 a black woman needs to work to make as much as a white man did in 2016, assuming they both started Jan. 1, 2016.

The day comes nearly four months after Equal Pay Day, which marked how far women had to work into 2017 to earn the same as their male counterparts.

Among those weighing in on the day’s significance is acclaimed athlete Serena Williams, who wrote, “The cycles of poverty, discrimination, and sexism are much, much harder to break than the record for Grand Slam titles.”

As the Economic Policy Institute lays out,

SCROLL TO CONTINUE WITH CONTENT