The sterile neutrino is a hypothetical fourth neutrino that has been proposed to solve the dark matter problem and to explain the accelerator neutrino anomalies. The adjective sterile is used to distinguish this neutrino type from the well-known active neutrinos in the Standard Model. Sterile neutrinos are very well-motivated elementary particles and can be obtained from a trivial extension of the standard model of particle physics. Their name reflects also the fact that these neutrinos are not affected by any of the known forces of nature except gravity, since these particles carry no charges and are singlets under all gauge groups of the standard model. If such particle exists it should be produced in the Sun’s interior through by vacuum oscillations mostly, and also by matter oscillations (or the Mikheyev–Smirnov–Wolfenstein effect). In a recent article I. Lopes computed the sterile neutrino spectrum emitted by the Sun (https://doi.org/10.1140/epjc/s10052-018-5770-8).