On the issue 20, 064501 of Physics of Plasmas, G. Genoud et al published their work on measurements of the effect of focal spot quality on self-guided laser wakefield accelerators. In this paper, we show that by controlling the focal spot quality with a deformable mirror, it is possible to increase the fraction of pulse energy contained within the central part of the focal spot, enhancing the amount of energy transfered to the plasma wakefield and to the accelerated electrons. More information and the full text of the paper can be found here.