Addition - East Wing - Library is a schematic in Skyrim: Hearthfire. It is used by the Player Housing system.
Add the East Wing Library using the Drafting Table. You can only add one East Wing section to a house.
You can only expand your house with new wings after completing the Main Hall
The library has bookshelves where you can store books you have collected.
Function
Use this schematic to add a East Wing section containing a Library