Many people read on their mobile and cannot add your book to their reading list on there. Adding to library is not the same as the reading list sadly. The top right hand corner above your book cover is where the add to reading list button is. Some people will add your book, just because the front cover is awesome!

Why is it important?

1.) When someone checks out another user's page, the reading list is very prominently displayed, with a large cover picture. If you get on someone's reading list, someone checking out their profile might spot your book.

2.) Being on reading lists may impact the charts, so try and get on them!

3.) It helps people remember your book if they want to read it later.

It is difficult to get on people's reading lists, but if you ask nicely in one of your chapters they might do it for you :).

Don't forget to vote :P

P.S. Please add this to your reading list ;)