Subversion question?

If I checked a file into Subversion and then realized I forgot to make it executable, how can I change the file permissions in Subversion?
I tried changing the permissions to 755 & touching the file, but it says there's no changes... So I made a change to a comment in the script and checked it in. When I check it out the file isn't executable. :(
I just ended up deleting the file and checking it in again with the proper permissions, but there must be another way to do it right?

A quick search shows that you may need to change the svn properties. In particular, set svn:executable.