“The Lean Startup” doesn’t have the word “market” in its index

I am a really big fan of the book The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses. So much so that I am using it as a "textbook" for the Entrepreneurship course I am teaching at Olin College.

Oddly enough, I couldn't find the word "market" in the index.