  We study the effects of a general type of features of the inflaton potential
on the spectrum and bispectrum of primordial curvature perturbations. These
features correspond to a discontinuity in the $n$-th order derivative of the
potential which are dumped exponentially away from the value of the field where
the feature happens. Interestingly we find that different values of the
amplitude and of the order of the feature can lead to the same effects on the
power spectrum on both large and short scales, and on the bispectrum at small
scales. Only taking into account the bispectrum at large scales it is possible
to resolve this degeneracy. We provide fully numerical calculations and
analytical approximations for the spectrum and the bispectrum, which are in
good agreement with each other. The analytical approximation allows to to
determine the class of features which give the same spectrum and can only be
distinguished with the bispectrum.
