For some nonfiction (especially textbooks) you wouldn't necessarily read in order, so it's hard to log those. It would be nice if each book had something like a checklist with each chapter and how many pages it is. You check one off when you complete any section and it calculates the total number of pages you've read so far. I have to read a lot in textbooks and it would be nice to be able to include that towards my page count more easily!