Thanks for that uh-oh - wasn't obvious to me. I guess the author thought it obvious since he didn't explain this, and he explains most things thoroughly in this book.
So the Bishop goes to g7 to pressure the d4 pawn, since it's awkward for White to defend without having c2-c3 at his disposal, right?
I'm working my way through Lakdawala's Caro-Kann book, and there's a sequence of moves I don't understand.
The book also covers Ng3, Bd3, Neg5 and Ned2 as well as Nc3 in the starting position of the diagram above, but only in the Nc3 line does Black fiancetto his K-side. My question is: Why does Black fiancetto against Nc3 but not in the other lines?