Sarah Tabrizi (UCL Queen Square Institute of Neurology, London, UK) and Cristina Sampaio (CHDI Foundation, Princeton, NJ, USA) discuss two papers on Huntington’s disease published in the July issue of The Lancet Neurology: a Position Paper outlining a new classification of the disease, called the Huntington’s Disease Integrated Staging System, and a Review on potential disease-modifying therapies.