Created attachment 1112880 [details]
Add-ons for Firefox in Gnome-Software

Description of problem:
I did a fresh installation of Fedora 23, and installed Devhelp 3.18.1 using "dnf install devhelp". Once I opened Devhelp the first time, I found that many APIs are missing. For example, APIs about Gtk+, GLib, etc. Later on, I asked for David's found that I should install some packages like gtk3-devel-docs and gtk-doc to get those APIs available in Devhelp.

Version-Release number of selected component (if applicable):
3.18.1

How reproducible:
Every time

Steps to Reproduce:
1.Install Fedora 23 x86_64
2.Install Devhelp 3.18.1

Actual results:
A lot of APIs are missing, such as APIs about Gtk+ and Glib.

Expected results:
All available APIs should be available, or at least prompt users to install them if needed.

Additional info:
So I'm thinking a way to improve this(some ideas from David King).

I think Devhelp should recommend users those packages that may be needed by itself. For example, in Gnome-Software, add a "Add-ons" section to recommend those docs packages(as shown in the attached picture). If users are installing Devhelp using command line, maybe devhelp can recommend those documentation packages.

That way, it would be better so that some users like me will not google it or ask someone else for help. It would be a very nice improvement, in my opinion.