 The study found that adding xylenase enzymes to cellulase enzymes improved the hydrolysis of pretreated lignocellulosic substrates by increasing the accessibility of the cellulase enzymes to the cellulose. Additionally, the synergy between the two enzymes further improved the hydrolysis process by increasing the swelling of the fibres and creating more porous structures, allowing for easier access to the cellulose. This article was offered by Sadler Jacken, Ernst Valder, and Hu Jing Wang.