In some implementations, a digital work provider provides a digital work and supplemental information related to the digital work for delivery to an electronic device. For example, the digital work provider may parse a digital work to identify objects in the digital work. The digital work provider may generate supplemental information for the digital work based on the objects. For example, the supplemental information may include an index identifying locations of occurrences of the objects identified in the digital work. The supplemental information may further include prestored content related to one or more of the objects. For instance, the digital work provider may obtain the prestored content from one or more authoritative network resources. The electronic device may display the supplemental information in response to a user selection of an object in the digital work during display of the digital work.