Thunar only generates GTK-doc for extension library (namely `thunarx`) and not thunar itself. But a documentation for internal function might be useful for several reasons: **1. Document readability** `Thunar` already has gtk annotations (a formatted comment on top of the function definition) for most function, but it is hard to read with that format. It may be parsed by gtk-doc generator and can be read easily. **2. Can encourage writing documentation** If a document is generated with gtk annotations, not writing a gtk annotation for a new function would seem problematic. Also, an MR only for gtk annotation would make much more sense with a presense of a document. **3. Ease a code transfer between `Thunar` and xfce libraries** Some parts of `Thunar` would make more sense when it is in `libxfce4ui` or `libxfce4util`. These two libraries generate gtk-doc, so it would be easier to move functions if they are already documented before transfer.