lucy24 - 9:18 am on Sep 28, 2013 (gmt 0)
Is this ok?
Sure, if your purpose is to tell robots that yes indeedy, I have a directory called /wp-admin/ that contains good stuff.
Never rely on robots.txt to protect really critical areas. Don't mention the directory's existence at all, and issue a blanket 403 to anyone who isn't you.