  Direct measurements of the Vollhardt crossing point coordinates were
performed making use data of dilatometric and ultrasound experiments on MnSi.
As is shown the crossing points are not invariant in the extended range of
magnetic field and should be viewed as a side effects of flattening and
spreading out the fluctuation maxima or minima by magnetic field~\cite{Sti16}.
Correspondingly the crossing point can not be identified with a characteristic
feature controlling the phase transition. So further studies are needed to
understand intriguing features of the phase diagram of helical itinerant magnet
MnSi.
