1. One or more computer-readable media having computer-executable instructions embodied thereon that, when executed on a computing device, cause the computing device to perform a method of identifying, from within a corpus of documents, a subject that is relevant to a topic and that is usable to enhance a topic-describing document, the method comprising: retrieving the topic-describing document and a linked document, wherein a hyperlink is embedded within text of the linked document that, when input, enables navigation to the topic-describing document; parsing text of the linked document to identify the subject, wherein a context of the subject suggests a degree of relevance of the subject to the topic; determining an enhancement type of the subject, wherein an enhancement type is a category of supplemental information that is usable to enhance the topic-describing document; transforming a first version of the topic-describing document into an enhanced version of the topic-describing document, wherein the enhanced version includes a presentation of the subject; and storing the enhanced version of the topic-describing document to be presented at runtime.