codex hacking/spamming query

I just looked at http://codex.wordpress.org/Writing_Posts, and it was full of junk, and links to a footwear company http://www.nextfas.com. I checked the history, and a user Nextfas87 had replaced all the genuine codex with a self advertisement.

I reverted the text, but wonder if this should be reported, and how, so am leaving a note here.