When editing Markdown files (.md, .mdwn, etc.) and Mediawiki files (.mw), I almost always need to have flyspell-mode loaded. How to have that automatically happen via configuration?


Put this in your .emacs:

(add-hook 'markdown-mode-hook 'flyspell-mode)

It will enable flyspell-mode whenever markdown-mode is entered; i.e. when you open markdown files.

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  • Adding (add-hook 'markdown-mode-hook 'flyspell-mode) had no effect AFAICT. After restarting Emacs and opening a .mdwn file, the mini-buffer shows the Markdown-mode is automatically enabled, but not the flyspell-mode. – qazwsx Oct 10 '15 at 18:05
  • 1
    Revisiting this thread after two years, now in Emacs 25.2, your solution seems to work now. I verified that Flyspell mode is turned on by restarting Emacs, opening a new file test.md, and seeing that Flyspell is listed in M-x describe-mode. – qazwsx Jun 11 '17 at 20:52

There are two answers recommending adding flyspell-mode as a markdown-mode-hook function. Perhaps the problem is that flyspell-mode is a toggle. There is also turn-on-flyspell, defined like so:

(defun turn-on-flyspell ()
  "Unconditionally turn on Flyspell mode."
  (flyspell-mode 1))

This is a built-in function which accomplishes the same thing as in marcanuy's answer.

So, this should do what you want, unconditionally:

(add-hook 'markdown-mode-hook 'turn-on-flyspell)
(add-hook 'mediawiki-mode-hook 'turn-on-flyspell)
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  • To avoid those problems, minor modes were changed years ago so that calling foo-mode from Elisp (e.g. via a major mode hook) just turns the mode ON rather than doing the toggling that happens via that function is called interactively. So no: you don't need to resort to turn-on-foo-mode (these functions are relics from the time before I made this change). – Stefan Jun 11 '17 at 0:49
  • Thanks for clarifying, @Stefan. I wondered why qazwsx had trouble with using the minor mode function directly. I also didn't realize at first that this was a two-year-old thread :) – Jason Blevins Jun 11 '17 at 20:48

Base on Trebuchette's answer:

(add-hook 'markdown-mode-hook 'flyspell-mode)
(add-hook 'mediawiki-mode-hook 'flyspell-mode)

But if you want to turn on flyspell-mode while editing text files in various major-modes, you can just use:

(add-hook 'text-mode-hook 'flyspell-mode)

this will works because markdown-mode and mediawiki-mode are base on text-mode. Analogously, we use prog-mode-hook to setup common programming environment.

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  • Adding (add-hook 'text-mode-hook 'flyspell-mode) to .emacs has no effect when I restarted Emacs and opened a .mdwn file. The .mdwn file did triggered Markdown-mode though. – qazwsx Oct 10 '15 at 18:02

I was looking for the same and finally found a solution that works:

(dolist (hook '(markdown-mode-hook))
      (add-hook hook (lambda () (flyspell-mode 1))))

Tested in GNU Emacs 25.1

Not tested this but should also work for other modes like mediawiki:

(dolist (hook '(markdown-mode-hook mediawiki-mode-hook))
      (add-hook hook (lambda () (flyspell-mode 1))))
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