Is there consumer demand to support Black-owned businesses? To explore, we investigate the impact of a new feature on a large online platform that made the race of a set of Black business owners salient to customers. We find that this feature substantially increased demand for Black-owned businesses - in the form of more calls to the restaurant, more delivery orders, and - using cell phone data from a different platform - more in person visits to the restaurant. New customers to Black-owned businesses were more likely to be White customers - suggesting demand among White restaurant goers for Black-owned businesses. The gains for Black-owned businesses vary across geographically fine-grained measures of racial prejudice: we observe larger gains in areas with less anti-Black bias, as measured by implicit association tests. We also find suggestive evidence that the effects are stronger in predominately White, Democratic-leaning areas.