Top mass combination

We present a combination of CMS top mass measurements in the lepton+jets, di-lepton and all-jets channels, using data recorded in 2010 and 2011 by the CMS experiment corresponding to an integrated luminosity of up to 5.0 fb$^{-1}$. We present two combinations. The first uses three published results and gives a resulting top mass of $173.32 \pm 0.27 \text{ (stat.)} \pm 1.02 \text{ (syst.)}$~GeV. The second also includes the latest preliminary CMS measurements and yields an improved top-quark mass measurement of $173.36 \pm 0.38 \text{ (stat.)} \pm 0.91 \text{ (syst.)}$~GeV.