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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: `font-lock-add-keywords' works... sometimes
Date: Tue, 19 Mar 2019 12:44:48 -0400
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References: <86sgvjjpeu.fsf@zoho.eu>
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> but not this
>
>     (font-lock-add-keywords 'text-mode
>      '(
>        ("yellow" . font-lock-function-name-face)
>       )
>      t) ; append [3]

You'd first have to clarify what you mean by "work", but my crystal ball
suggests that text-m,ode does not enable font-lock by default, contrary
to message-mode.


        Stefan