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#### 22.2.3 Getting Help about a Major Mode

The `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.

Command: describe-mode &optional buffer

  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 Accessing Documentation).

  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.