Chapter 6 turns to rules of assertion on the hearer side. One of the central aims of this chapter is to argue for one specific such rule which requires hearers believe what is asserted. We argue that in order to make proper sense of testimonial injustice, we must countenance a duty to believe on the part of the hearer. Having looked at some proposals that emerge from recent literature on conversational pressure and found them wanting, we offer a functionalist account of this duty to belief.