In a recent paper [Journal of Physics: Condensed Matter **32**, 275301 (2020)], C. Núñez *et al* present a thorough study of the thermoelectric properties of silicene nanoribbons in the presence of a random distribution of atomic vacancies. By using a linear approach within the Landauer formalism, they calculate phonon and electron thermal conductances, the electric conductance, the Seebeck coefficient and the figure of merit of the nanoribbons. They found a sizable reduction of the phonon thermal conductance as a function of the vacancy concentration over a wide range of temperature. At the same time, the electric properties are not severely deteriorated, leading to an overall remarkable thermoelectric efficiency. They conclude that the incorporation of vacancies paves the way for designing better and more efficient nanoscale thermoelectric devices.