Total neutral hydrogen (H I) mass versus V-band luminosity for the simulated dwarf galaxies. We compute the H I mass directly from the simulation, where the abundance of H I is calculated by integrating the ionisation equations for primordial species. The filled coloured circles represent Bashful (red) and Doc (blue) in our simulation, at z = 0. The empty circles with coloured edges correspond to Bashful (red), Doc (blue), Dopey (purple) and Grumpy (green) simulated in Shen et al. (2014) with the blastwave feedback model. The empty symbols represent satellite galaxies of the Milky Way (diamonds) and Andromeda (squares) from the original sample of Local Group galaxies published by McConnachie (2012). The dashed line indicates L_V/M_HI = 1.