The Immersive Redliner supports annotation of three-dimensional artifacts in collaborative design. It enables team members to drop annotation markers in a VRML world that are linked to comment text stored on a server. Visitors to the world later can review the design annotations in the locations where they were made. We report on two phases of the Redliner project: the first involves a hypothetical design scenario, the second a real application on a rehabilitation in a residence building in Strasbourg.