Please add GenericName and Comment in desktop file. Reproducible: Always
If I understand it correctly, those additional fields are relevant mainly inside the Gnome desktop, but khelpcenter has OnlyShowIn=KDE in its desktop file. Are those fields really important?
GenericName and Comment uses by KDE. Any tooltip is interesting instead of nothing. These fields are not mandatory, but very useful especially for newbie, child.
At least one of those, not sure which is shown either as sub-title or title (depending on your config) in the plasma k-menu, so yeah they're relatively important.
Git commit 3b5a6eef926d421063c5f0f4ee0718c0cf131f00 by Luigi Toscano. Committed on 22/03/2016 at 23:26. Pushed by ltoscano into branch 'master'. Add GenericName and Comment to the desktop file M +2 -0 org.kde.Help.desktop http://commits.kde.org/khelpcenter/3b5a6eef926d421063c5f0f4ee0718c0cf131f00