#gitbook-plugin-toc This plugin will add table of content to the page and provide navigation function inside a page. Add `` to the markdown files. When you build the book, it will insert a table of content where you insert `` `book.json` Config: ``` { "plugins": ["toc"], "pluginsConfig": { "toc": { "addClass": true, "className": "toc" } } } ``` You can add this config to add a HTML ClassName to the TOC `ul` element