It's demonstrated in examples so it's not critical issue but I believe it should be stated in Chisel Tutorial in explicit way. When you are reading a tutorial you assume that you don't need to do ...

Chisel is a mod for Minecraft which adds aesthetic blocks to the game through the use of a chisel. Originally created by AUTOMATIC_MAIDEN, it was ported to Minecraft 1.7.2 by asie, and maintained by ...