A study of jet production in association with W bosons has been performed, in events with the W decaying to a muon. Jets are required to have pT>30 GeV and |eta|<2.4. Muons are required to have pT>25 and |eta|<2.1. Jets are only considered if they are separated from the muon by ΔR>0.5. Muons are dressed with photons in a cone of 0.1 around the muon.