Title in org agenda block view

Question

Is it possible to set a title for a block in multi-command agenda view? I currently see this:

... normal agenda view here
========================================================================================
Headlines with TAGS match: -SCHEDULED={.+}-DEADLINE={.+}/-DONE-DEFERRED-CANCELLED
  work:       TODO Some task  

I'd like to replace the line starting with "Headers with TAGS" with a custom title, eg "Unscheduled tasks".

This is the value of org-agenda-custom-commands:

  (setq org-agenda-custom-commands
        `(("n" "Agenda and TODOs"
           ((agenda "")
            (tags "-SCHEDULED={.+}-DEADLINE={.+}/-DONE-DEFERRED-CANCELLED")
            (alltodo "")))))

Answer 1

Found documentation on it from org here. Last argument to the agenda command is a list of "settings" for the view/block. There's a setting called org-agenda-overriding-header specifically for this. Furthermore there is a some built-in support for my purposes, so the block became this arguably cleaner version:

  (alltodo ""
           ((org-agenda-skip-function '(org-agenda-skip-entry-if 'todo 'done 'scheduled 'deadline))
           (org-agenda-overriding-header "Unscheduled tasks")))