Spirit Airlines has revised its "contract of carriage" to include updated guidelines for passenger conduct and attire.

Passengers may not be allowed to board Spirit Airlines flights if their tattoos or clothes are deemed “offensive,” according to an updated contract between travelers and carriers. Airline officials updated Spirit’s contract of carriage on Wednesday,

Every airline has a contract of carriage, a legally binding document that flyers agree to abide by while doing business with the airline. These contracts contain language addressing passenger dress, though some are vague ― and very few travelers actually take the time to read them.