Emacs column marker

Very often some code style has limited length of code line and its quite good, when IDE knows about such limits.

I've added to Emacs column-marker

(add-to-list 'load-path (expand-file-name "~/emacs/column-marker"))
(require 'column-marker)
(add-hook 'ada-mode-hook (lambda () (interactive) (column-marker-3 79))) 

Now, if in Ada code some line exceeds 79-symbols limit, Emacs will highlight it with red.