old_contents: # Supported 16 color values:
  #   'h0' (color number 0) through 'h15' (color number 15)
  #    or
  #   'default' (use the terminal's default foreground),
  #   'black', 'dark red', 'dark green', 'brown', 'dark blue',
  #   'dark magenta', 'dark cyan', 'light gray', 'dark gray',
  #   'light red', 'light green', 'yellow', 'light blue',
  #   'light magenta', 'light cyan', 'white'
  #
  # Supported 256 color values:
  #   'h0' (color number 0) through 'h255' (color number 255)
  #
  # 256 color chart: http://en.wikipedia.org/wiki/File:Xterm_color_chart.png
  #
  # "setting_name": (foreground_color, background_color),
  
  palette.update({
      "source": (add_setting("black", "underline"), "dark green"),
      "comment": ("h250", "default")
      })
  
new_contents: # Supported 16 color values:
  #   'h0' (color number 0) through 'h15' (color number 15)
  #    or
  #   'default' (use the terminal's default foreground),
  #   'black', 'dark red', 'dark green', 'brown', 'dark blue',
  #   'dark magenta', 'dark cyan', 'light gray', 'dark gray',
  #   'light red', 'light green', 'yellow', 'light blue',
  #   'light magenta', 'light cyan', 'white'
  #
  # Supported 256 color values:
  #   'h0' (color number 0) through 'h255' (color number 255)
  #
  # 256 color chart: http://en.wikipedia.org/wiki/File:Xterm_color_chart.png
  #
  # "setting_name": (foreground_color, background_color),
  
  # See this URL to see what keys there are:
  # https://github.com/inducer/pudb/blob/master/pudb/theme.py
  
  palette.update({
      "source": (add_setting("black", "underline"), "dark green"),
      "comment": ("h250", "default")
      })
  
subject: Add link to defined colors to example theme