Methods and systems for enriching information streams with supplemental content are disclosed. A contextual publisher may eavesdrop on an information distribution service, such as a news wire, and detect the presence of particular messages having subject matter in which the contextual publisher has expertise. The contextual publisher may thus generate content that is supplemental to the messages, and forward this supplemental content to the original recipients of the messages. In this way, users may receive timely information about topics in which they have a current interest.