duggan/frontend — comment on commit e382fa1cbaf09b4fd1794c7384758c76fa37a260
File: src/libraries/controllers/SetupController.php line 561
By jmathai:

We're not doing anything atm with this query parameter but will want to have something for the theme to display confirmation and error messages. It's probably a bigger task and `m=welcome` won't be how we implement it :). For now, should probably just leave this in.