Findings　on　the　stability　of　nanocrystalline　grain　structures　reported　by　S.A.　Sabeti　et　al.　in　Computational　Materials　Science　[1]　are　commented.　In　particular,　the　validity　of　Molecular　Dynamics　simulations　and　their　comparability　with　results　of　thermodynamic　modeling　[2]　are　discussed.　The　conclusion　in　[1]　that　＂by　the　increase　of　the　temperature,　the　possibility　for　the　stoppage　of　grain　growth　in　nanocrystalline　Pd　is　facilitated＂　is　discussed　critically.　(C)　2011　Elsevier　B.V.　All　rights　reserved.