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In a recent publication [Appl. Phys. Lett. 104, 092601 (2014)] Ciovati et al.claim that: 1) thermal effects were disregarded in our original work [*]; 2)increase of $Q$ at $T=2$ K up to about $B\sim$100 mT in nitrogen doped cavitiesis just an extended low field $Q$ slope observed in non-doped cavities, whichis furthermore attributed to the decrease of the "BCS" component of surfaceresistance. Here we show that both claims are wrong and the conclusions ofCiovati et al. are incorrect.  [*] A. Romanenko and A. Grassellino, Appl. Phys. Lett. 102, 252603 (2013)

Comment on the "Decrease of the surface resistance in superconducting niobium resonator cavities by the microwave field"