message: Add references to eBook
diff: @@ -150,19 +150,21 @@ Feel free to have a look at the latest version of OWASP Juice Shop:
  ## Customization
  Via a YAML configuration file in `/config`, the OWASP Juice Shop can be
  -customized in its content and look & feel. For detailed instructions and
  -examples please refer to
  -[the "Customization" chapter of our companion guide ebook](https://bkimminich.gitbooks.io/pwning-owasp-juice-shop/content/part1/customization.html).
  +customized in its content and look & feel.
  -> Kudos for envisioning and original implementation of this feature go
  -> to [@wurstbrot](https://github.com/wurstbrot)!
  +For detailed instructions and examples please refer to
  +[the _Customization_ chapter of our (free) companion guide ebook](https://bkimminich.gitbooks.io/pwning-owasp-juice-shop/content/part1/customization.html).
  ## CTF-Extension
  -If you want to run OWASP Juice Shop as a Capture-The-Flag event you want
  -set it up along with a [CTFd](https://ctfd.io) server easily using the
  -official extension
  -[`juice-shop-ctf-cli`](https://www.npmjs.com/package/juice-shop-ctf-cli).
  +If you want to run OWASP Juice Shop as a Capture-The-Flag event, we
  +recommend you set it up along with a [CTFd](https://ctfd.io) server
  +conveniently using the official
  +[`juice-shop-ctf-cli`](https://www.npmjs.com/package/juice-shop-ctf-cli)
  +tool.
  +
  +For detailed instructions and examples please refer to
  +[the _Hosting a CTF event_ appendix of our (free) companion guide ebook](https://bkimminich.gitbooks.io/pwning-owasp-juice-shop/content/appendix/ctf.html).
  ## Additional Documentation
  