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### 5.16 How do I turn on `auto-fill-mode` by default?

To turn on `auto-fill-mode` just once for one buffer, use `M-x auto-fill-mode`.

To turn it on for every buffer in a certain mode, you must use the hook for that mode. For example, to turn on `auto-fill` mode for all text buffers, including the following in your `.emacs` file:

    (add-hook 'text-mode-hook 'turn-on-auto-fill)

If you want `auto-fill` mode on in all major modes, do this:

    (setq-default auto-fill-function 'do-auto-fill)