A three-compartment water-soluble capsule, each compartment containing a part of a liquid detergent composition, the compartments being arranged side-by-side to provide a central compartment flanked on respective sides by a first and a second side compartment, the capsule being formed from two sheets of water-soluble film, the two sheets of film being sealed together to form a sealing web around each compartment, the sealing web lying in a sealing plane, each of the three compartments extending at a maximum the same distance above and below the sealing plane, wherein the sealing web comprises an annular sealing web defining the periphery of the capsule, and two internal sealing webs which each extend across the capsule, each internal sealing web serving to connect the central compartment with an adjacent side compartment and to separate their contents, wherein each internal sealing web has a continuously curved shape.