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#### Cover
-A cover image can be set by creating a file: **/cover.jpg** or **cover.png**.
+A cover image can be set by creating a file: **/cover.jpg**.
The best resolution is **1800x2360**. The generation of the cover can be done automatically using the plugin [autocover](https://github.com/GitbookIO/plugin-autocover).
+A small version of the cover can also be set by creating a file: **/cover_small.jpg**.
+
#### Plugins
Plugins can used to extend your book's functionality. Read [GitbookIO/plugin](https://github.com/GitbookIO/plugin) for more information about how to build a plugin for gitbook.