From ArchWiki

Hi Archies :)

Using this wiki gave us some little trouble since both methods (1st & Alternate method) do say nothing about necessary ~/.xinitrc configuration.

Yes this is "not to mention" to lot of people.

But some may be in the same situation than me, who did not use .xinitrc before, since I always start from command line : startxfce4 / kde / whatever WM Thereafter I didn't check the ~/.xinitrc file since we installed Arch Linux. And it showed the wrong configuration like "exec fluxbox" --but we do not have that WM installed...

So to say we spent a bunch of time googling before I thought about the .xinitrc :(

I suggest to add a line about one needs to check his ~/.xinitrc after point 5. (Alternate Method)