  The inclusive cross-section for tW production in proton-proton collisions at
$\sqrt{s} = 13$ TeV is measured for an integrated luminosity of 35.9 fb$^{-1}$
collected by the CMS experiment. The measurement is performed using events with
one electron and one muon in the final state and at least one b-quark jet, and
utilises kinematic differences between the signal and the dominating $t\bar{t}$
background using multivariant discriminants which is designed to disentangle
the two processes. The measured cross-section of $\sigma = 63.1 \pm 1.8~({\rm
stat}) \pm 6.4~({\rm syst}) \pm 2.1~({\rm lumi})$ pb is observed to be in
agreement with the Standard Model.
