A packaged detergent composition and/or additive comprises at least one oxygen releasing compound for use with a device for dispensing and/or dosing the detergent composition and/or additive into an automatic dishwashing machine over a plurality of washing cycles, wherein the package is made of a material with an oxygen transfer rate of more than 10 cm.sup.3/m.sup.2/bar/24 h, preferably more than 50 cm.sup.3/m.sup.2/bar/24 h, and most preferably more than 100 cm.sup.3/m.sup.2/bar/24 h, measured at 23.degree. C. and 0% Equilibrium Relative Humidity. A method of packaging the detergent composition and/or additive is also described.