Twitter announced last week that it would block users engaged in homophobic and transphobic abuse.

In a blog post titled Fighting abuse to protect freedom of expression, Twitter Trust + Safety Director Megan Cristina announced the changes to Twitter Rules.

“Today, as part of our continued efforts to combat abuse, we're updating the Twitter Rules to clarify what we consider to be abusive behavior and hateful conduct,” she wrote. “The updated language emphasizes that Twitter will not tolerate behavior intended to harass, intimidate or use fear to silence another user's voice. As always, we embrace and encourage diverse opinions and beliefs – but we will continue to take action on accounts that cross the line into abuse.”

Twitter Rules now explicitly ban users from participating in “hateful conduct,” which includes homophobic and transphobic language.

“You may not promote violence against or directly attack or threaten other people on the basis of race, ethnicity, national origin, sexual orientation, gender, gender identity, religious affiliation, age, disability, or disease. We also do not allow accounts whose primary purpose is inciting harm towards others on the basis of these categories,” the rules state.

Twitter said that it may permanently suspend accounts that fail to abide by its rules.