We have performed a deep photometric study of the edge-on spiral galaxy NGC 4565. Least-square fitting of the light distribution by using exponential- like functions revealed several disc components and a sharp radial cutoff. However, the most spectacular discovery was that of an extended optical warp that overlaps with the previously known gaseous warp. This optical counterpart puts important constraints on the theories for the formation of such warps, since the detection at optical wavelengths implies that stars have formed out of the gas. Because only a few galaxies have been studied down to these faint levels, the question whether faint stellar warps are common arises. We will follow up this detection with data we have - at radio, infrared and optical wavelengths - on the edge-on galaxy UGC9977.