This module adds syntax highlighting for TODO/FIXME/NOTE tags in programming major-modes.
What keywords are highlighted (and their color) can be customized through hl-todo-keyword-faces.
;; the default
(setq hl-todo-keyword-faces
`(("TODO" . ,(face-foreground 'warning))
("FIXME" . ,(face-foreground 'error))
("NOTE" . ,(face-foreground 'success))))