Well in fact you had 2 questions.. you had the answer to the one in title, maybe we all believed you knew what you wanted to add/modify but was unsure if to be done with vi or a special tool as often the case in AIX...
We like to see the source if not personal doc ( being honest is most important ), and so there is no bad "form" as long as the link you provide can be seen by all ( public - no need of account/passwd) but the proper way...

Thanks for your contribution

All the best