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Let W be a finite Coxeter group, W J a parabolic subgroup of W and X J the set of distinguished coset representatives of W J in W equipped with the induced weak Bruhat ordering of W. All instances when X J is a distributive lattice are known. In this note we present a new short conceptual proof of this result. s −→ y whenever y = xs and l(y) = l(x) + 1 for x, y ∈ X J and s ∈ S. Thus, Γ J is the labelled Hasse diagram of the poset (X J , ). Note that Γ ∅ is the Cayley graph of W with respect todoi:10.1515/jgth.2003.021 fatcat:mxnm7bgrhjektpfz7qu76k4isu