The Bookshelf API is a small library of useful functions for mod creators. Players may need it to run some mods, such as Enchantment Descriptions. Install it only if it is required for the mod to work.
How to install Bookshelf API library
- Make sure you have installed Minecraft Forge.
- Download the mod for your version of the game.
- Put it in the ‘mods’ folder, which is located in the game folder.