Section 9 Varying brush size - misses one method
Section 9 Varying brush size lists three methods for changing the brush/tool size. It omits using the [ , ], Shift+[ and Shift+] keys to change the brush size by -1, +1, -10 and +10 respectively. I believe that these are the default settings for these keys. It avoids having to reprogram the mouse or cursor keys as per methods 2 and 3. I find it useful when repairing scans of old photographs.