We wrote a circular “upgrade” of the well-known technical specifications of the VMSW; from now on, architects can also prescribe circular materials, systems, products in (public or private) tenders: the texts are brand-neutral, they always allow three possible manufacturers, and they are highlighted so that the updates can easily be found; the pre-screening for the alleged circularity was done by VIBE; the project was supported by Vlaanderen Circulair; the technical specifications can be found on www.circubestek.be