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I want a double %% to start my comments in latex documents. I'have found two solutions suggested

;; solution 1
(add-hook 'latex-mode-hook  '(lambda() (setq comment-start "%% ")))

;; solution 2
(add-hook 'latex-mode-hook (lambda () (setq-local comment-add 0)))

but both don't work.

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The Auctex LaTeX mode hook is LaTeX-mode-hook (note the capitalization). So try

(add-hook 'LaTeX-mode-hook  (lambda() (setq comment-start "%% ")))

Note also that lambda expressions are self-evaluating so you don't need to quote them in this context.

I am assuming you are using M-; to comment things, otherwise comment-start does not enter into the equation.

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  • Thanks, brilliant this works. – PinkCollins Apr 18 at 8:22

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