Clarify comment.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4223 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 13, 2008
E46HISCJHF6LFOULGABYP42Y3FINYXAQFLW5VRMCMJSL6CLU3RLAC
Change contents