  In a recent letter Blumberg and collaborators claim that a non-monotonic
$d_{x^2-y^2}$ form for the superconducting order parameter is required to
explain their Raman scattering measurements in Nd$_{2-x}$Ce$_x$CuO$_4$ . In
this comment we show with a simple model calculation that the basis for this
conclusion is insufficient. The proposed functional dependence of the gap is
neither consistent with their measured spectra nor compatible with other
experimental results. Therefore the issue of the superconduing gap in
electron-doped systems cannot be considered solved by now.
