A proposed change to Texas‘s high school social studies standards is sparking outrage by requiring teaching about “the Prophet Mohammed’s brutal military campaigns.”

Texas’s Republican-controlled Board of Education passed an amendment that included the Islam-related history guidance on Thursday while postponing a further vote on high school standards until September, according to multiple reports. Activists encouraged Texans to contact board members to advocate against the standards before a Friday meeting scheduled to address other social studies proposals, such as the inclusion of biblical stories for study.