anchor.diff:  
    $ asciidoctor-pdf -a pdf-theme=basic-theme.yml -a pdf-fontsdir=path/to/fonts document.adoc
   
  -You can specify multiple directories by separating the entries with a semi-colon and enclosing the value in double quotes:
  +You can specify multiple directories by separating the paths with either a comma (`,`):
  +
  + $ asciidoctor-pdf -a pdf-theme=basic-theme.yml -a pdf-fontsdir=path/to/fonts,path/to/more-fonts document.adoc
  +
  +or a semi-colon (`;`) (which requires enclosing the combined value in double quotes to escape the delimiter from the shell):
   
    $ asciidoctor-pdf -a pdf-theme=basic-theme.yml -a pdf-fontsdir="path/to/fonts;path/to/more-fonts" document.adoc
   
  -To include the location of the bundled fonts in the search, add the `GEM_FONTS_DIR` token:
  +To include the location of the bundled fonts in the search, include the `GEM_FONTS_DIR` token in the list:
   
    $ asciidoctor-pdf -a pdf-theme=basic-theme.yml -a pdf-fontsdir="path/to/fonts;GEM_FONTS_DIR" document.adoc
   
  
positive.code: If `pdf-theme` ends with `.yml`, and `pdf-themesdir` is not specified, then `pdf-themesdir` defaults to the directory of the path specified by `pdf-theme`.
  
  pdf-fontsdir:: The directory or directories where the fonts used by your theme, if any, are located.
  Multiple entries must be separated by a semi-colon.
  To reference a file inside a JAR file on the classpath, prefix with the path with `uri:classloader:` (AsciidoctorJ only).
  _Specifying an absolute path is recommended._
  
  
negative.code: Used as the fallback font in the `default-with-fallback-font` theme.
  
  TIP: If you want to specify the location of custom fonts using the `pdf-fontsdir` attribute, yet still be able to reference the bundled fonts, you need to refer to the bundled fonts using the `GEM_FONTS_DIR` token.
  To do so, you can either a) prefix the path of the bundled font in the theme file with the segment `GEM_FONTS_DIR` (e.g., `GEM_FONTS_DIR/mplus1p-regular-fallback.ttf`, or b) use relative paths in the theme file and include `GEM_FONT_DIR` in the value of the `pdf-fontsdir` attribute separated by the location of your custom fonts using a comma (e.g., `path/to/your/fonts,GEM_FONTS_DIR`) or a semi-colon (e.g., `path/to/your/fonts;GEM_FONTS_DIR`).
  
  === Custom Fonts
  
  