How can I force git to recognize a change change in file modes?

Hi,

I checked in a slew of scripts, only to realize that the file
permissions were too open (I want them to be chmod 700, not chmod
755).  Somehow I thought that git was tracking those permission bits,
but simply using "chmod 700 <fileset>; git add <fileset>" did not add
the change of file modes, well, at least git status output doesn't
show it. Is there a way to do this?

Thanks,
Brent