Seciton 1.6 example - description mismatch

[tylervipond]

In section 1.6 towards the end of this sub-section on blocking access there is a line that reads: "We do however add it to the dependency list for MonsterAI - the AI relies on its results, so it has to be done.", but none of the examples in the section seem to add MapIndexingSystem as a dependency of MonsterAI, it's possible I just missed it though.

[thebracket]

I'll see about getting this merged. Having a poor day in terms of code I write actually working, so I may belay this until the weekend or Monday!