Organic ferroelectric compounds such as KH2PO4 and squaric acid, have attracted much interest in the past due to their potential in applications [1]. This interest has been revived recently by the discovery of ferroelectricity above room-temperature in croconic acid [2], a member of a homologous series of small organic molecules with composition CnOnH2. Squaric acid corresponds to n=4. We ask for 8 days on SXD to record 3D data sets of diffuse scattering in squaric acid at room temperature and in the high-temperature phase at 450K in zero field and electric field of 1kV/cm applied along the crystallographic a direction.