Quantum spin liquids (QSLs) are intriguing states of matter in which magnetic frustration and strong quantum fluctuations prevent classical long-range magnetic order. To date, one of the best experimental realisations of such a system is herbertsmithite, ZnCu3(OH)6Cl2, but the exact nature of its QSL state remains a matter of debate. Here, we propose to explore Zn-doped deuterated barlowite, ZnxCu4-x(OD)6FBr, by powder neutron diffraction (PND). Like herbertsmithite, barlowite contains frustrated kagome layers of Cu2+ ions. The x = 0 member of the series undergoes a magnetic ordering transition at T ~ 15 K, but the effects of doping the system with non-magnetic Zn2+ ions are yet to be fully explored. PND is necessary in order to elucidate the nature of the spin order in barlowite below 15 K as well as determining the degree of Zn/Cu (dis)order.