The authors investigate the behaviour of delay differential equations with cubic nonlinearities in the vicinity of Hopf bifurcation points by a multiple scale ansatz. Comparing their approximation with numerical results, they find good agreement and conclude that it isn’t necessary to perform center manifold reduction to remove the infinitely many stable modes. This conclusion sounds very questionable, because it is well known, that for skew symmetric nonlinearities the simple Galerkin approximation yields correct results, whereas for quadratic terms center manifold reduction – or some equivalent treatment of the stable modes – is necessary.