  We find that the proof in the recent paper$\textsuperscript{\cite{14}}$ can
not justify the authors' conclusion. We provide a real proof that any state
will eventually evolves to the Woltjer-Taylor state exponentially. However,
this kind of evolution is is mainly due to Joule heat, which also makes the
magnetic field vanishes exponentially. Zero Woltjer-Taylor states are not
physically attractive. Instead of examine $\Delta$, we introduce the quantity
$\theta_{\nabla \times \vec{B},\vec{B}}$ and $R$ to examine if the plasma
reaches to the strong (general) Woltjer-Taylor state, and then derive the
condition for the evolution to the strong/general Woltjer-Taylor state.
