The postponed 2020 Summer Olympics are set to start in July with a new warning for athletes.
The International Olympic Committee has specifically banned the slogan "Black LivesMatter'" from any athlete's clothing or gear.
It's part of the IOC's long-standing rules about no political demonstrations on the playing field, medal stand, or during official ceremonies.
Words like "peace", "respect", "solidarity", "inclusion", and "equality" will be allowed on t-shirts.
So far, IOC officials have not said what types of punishment athletes could face for violating the rules.