I wrote most of my documentation in AsciiDoc, naming files with the extension .adoc. I want to apply styling to the AsciiDoc markup so that I can easily differentiate it from my content.

Operating system: Fedora 25 (GNOME edition)
Geany version: 1.29

I read the Geany manual and did the following steps in a Terminal

1. Navigated to ~/.config/geany/filedefs
2. cp /usr/share/geany/filedefs/filetypes.asciidoc
3. Opened filetypes.asciidoc in Geany
4. Added to the [styling] section the following, copied from the filetypes,markdown file:

default=default
strong=string_3
emphasis=string_4
header1=keyword_1
header2=keyword_1
header3=keyword_1
header4=keyword_1
header5=keyword_1
header6=keyword_1

5. Opened an AsciiDoc marked-up file.

Result?

The header markers in the AsciiDoc file - '=' and '==' and so on do not appear to be styled. The header characters in a sample Markdown file *are* styled.

When I open the example AsciiDoc file, Geany recognises it as such.

I feel I'm missing something simple here, but I can't work out just what.