I write very few service controllers and have never tried to associate
/additionalDetails.html/ (or /additionalDetails.md/) with a controller,
but today I need to do just that (if supported).
I have a perfectly working (new) controller service, its interface,
tests for it (duh) and also:
Russell,
Additional details are supported for any of the extension types. I can't
tell from your message what's happening but I can point you to an example.
[1] is an example of additional details for the CSVReader Controller
Service. When that directory structure is followed, it should get unpack
