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The aim of this comment is to call to the attention of DSR readers a basicfact. The introduction of noncommutative structures in problems like the oneaddressed in [1] is not necessary for the understanding of DSR physics. It canbe described just as the relativistic free particle problem in a differentparametrization.

DSR and Canonical Transformations: A Comment on a ``A Lagrangian for DSR particle and the role of noncommutativity''