An awning and a method of operating the awning are provided. The awning includes a canopy, a roller and an adjustment tube. The canopy includes a proximal edge. The canopy can be wound about the roller with the proximal edge secured along the roller. The roller includes a first longitudinal end and a second longitudinal end. The adjustment tube includes a small base and a large base. The adjustment tube is mounted around the roller near the second longitudinal end so that the small base is nearer to the first longitudinal end than the large base. The adjustment tube is slidably movable along the roller so that the adjustment tube can move toward or away from the first longitudinal end between an innermost position and an outermost position. The adjustment tube is located nearer to the second longitudinal end at the outermost position than at the innermost position.