Simple reconfigure

[Jone]

Hello! If I make little changes, like such:
was:

  (users (cons (user-account
                (name "jone")
                (comment "Jone")
                (group "users")
                (supplementary-groups '("wheel" "netdev" "audio" "video"))
                (home-directory "/home/jone"))
               %base-user-accounts))

now:

  (users (cons (user-account
                (name "jone")
                (comment "Jone")
                (group "users")
                (supplementary-groups '("wheel" "netdev" "audio" "video"))
                (home-directory "/home/jone"))
                           (user-account
                                (name "guest")
                                (comment "Guest")
                                (password "guest" "something")
                                (group "users")
                                (supplementary-groups '("netdev" "audio" 
"video"))
                                (home-directory "/home/guest"))
               %base-user-accounts))

as will be correct: just run 'guix system reconfigure' without options,
or .. ? Can Guix only update configuration files, offline?