A cap assembly for a drug delivery device is described comprising a cap, and a clip element which is configured to be attached to the cap, the clip element comprising a first component, and a second component, wherein the first component is at least partly received by the second component, wherein the first component and the second component are firmly connected to one another, and wherein the connection between the first component and the second component is the means by which the second component is attached to the cap. Moreover, a method for assembling a cap assembly is described.
