We note some noise in the correlations of ñH While some of it may derive from insufficient statistics of the AIMD simulations and of the sampling of adsorption energies, we believe that we also encounter a systematic deviation for all Pt surfaces (Pt(111), Pt(100), and Pt(211)). This deviation becomes most apparent in Figure . It has been previously noted that liquid water is particularly stable on Pt(111) surfaces, a feature which has been attributed to the lattice constant of Pt leading to a relatively unstrained hexagonal ice-like water structure on this surface . It is notable, then, that the Pt(100) and Pt(211) surface also seem to have higher water coverage than ∆E OH would predict, implying that the stability of water on Pt might have a different origin.