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In this paper we argue that rounded "hills" or "valleys" demonstrated by theheat capacity, thermal expansion coefficient, and elastic module areindications of a smeared second order phase transition, which is flattened andspread out by the application of a magnetic field. As a result, some of thecurves which display a temperature dependence of the corresponding quantitiescross almost at a single point. Thus, the Vollhardt crossing point should notbe identified with any specific energy scale. The smeared phase transition inMnSi preceding the helical first order transition most probably corresponds tothe planar ferromagnetic ordering, with a small or negligible correlationbetween planes. At lower temperatures, the system of ferromagnetic planesbecomes correlated, acquiring a helical twist.

Notes on the Vollhardt "invariant" and phase transition in the helical itinerant magnet MnSi