anchor.diff:  ]
   ```
   
  -Add the files which you want to be rendered along with the format. 
  +Add the files that you want to be rendered, along with the desired format.
   In this case `pdf`.
   
   .Hint
  
positive.code: The result looks more like a nicely rendered book than a print-to-PDF HTML page.
  
  For a file to be rendered, it has to be configured in the `doctoolchainConfig.groovy` file.
  There you will find a section like the following:
  
  ```
  inputFiles = [
  
negative.code: ====
  Why do you need to configure the files to be rendered?
  
  Asciidoctor renders all `.adoc` files by default. It doesn't matter if they are the main documents or chapters you want to include.
  Most people only want to convert selected files to PDF, so that's why you need to configure which ones.
  
  ====
  
  == Creating a Custom PDF Theme
  