A California high school has planned a walk-out in protest of a poster that many say is offensive to Black History Month.

On Feb. 5, a poster was found hanging on the Lowell High School library door that read, “Happy Black History Month #Gang.”

Members of the school’s Black population and their allies felt the statement referred to them and Black History Month negatively.

“In response to this clear anti-Blackness, past incidents of racism, and an uncomfortable climate for Black students, the Black Student Union (BSU) has scheduled a walk-out for today, February 23, 2016 at 9am,” Afrikan Black Coalition Communications Chief Kadijah Means said in a statement. “The aim of this march is to express discontent with the unsafe environment for Black students, and the administration’s negligence in addressing the BSU’s concerns.”

Read more at JET.