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24.2.3 Getting Help about a Major ModeThe describe-mode function provides information about major modes. It is normally bound to C-h m. It uses the value of the variable major-mode (see Major Modes), which is why every major mode command needs to set that variable.
This command displays the documentation of the current buffer’s major mode and minor modes. It uses the documentation function to retrieve the documentation strings of the major and minor mode commands (see Access to Documentation Strings).
If called from Lisp with a non-nil buffer argument, this function displays the documentation for that buffer’s major and minor modes, rather than those of the current buffer.
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