∗ For helpful comments and discussion, I am grateful to Maria Bittner, Adam Bjorndahl, Jeroen

discusses three potential varieties of update: updates to the common ground, structuring updates, and updates that introduce discourse referents. These different types of update are used to model different aspects of natural language phenomena. Not-at-issue information directly updates the common ground. The illocutionary mood of a sen-tence structures the context. Other updates introduce discourse referents of various types, including propositional discourse referents for at-issue information. Distinguishing these types of update allows a unified treatment of a broad range of phenomena, including the grammatical evidentials found in Cheyenne (Algonquian) as well as English evidential parentheticals, ap-positives, and mood marking. An update semantics that can formalize all of these varieties of update is given, integrating the different kinds of semantic contributions into a single representation of meaning