How polarization helps us in making pictures of planets around other stars

We know now that hundreds of stars are host to planets, just like the sun is the center to our solar system of planets. But for most of these planetary systems we only have indirect evidence: we have never seen the light from these planets, because they are very faint compared to their host star. Considering the fact that starlight is unpolarized and reflected light off the planet is very polarized, polarization measurements will allow astronomers to take pictures of exoplanets. Moreover, the polarization also holds clues about what the planet actually looks like.