(add-hook 'texinfo-mode-hook 'turn-on-font-lock)
;;; enables the font-lock mode in C Mode
-(add-hook 'c-mode-hook 'turn-on-font-lock)
+(add-hook 'c-mode-hook 'turn-on-font-lock)
@end example
To turn on the font-lock mode in other Major Modes like emacs-lisp, just