"diff" command missing in cygwin distribution ?

Hi,

I just installed cygwin 2.573.2.2 directly from internet.
Trying to get my linux-scripts working I repeated the installation a few times (only changing text-mode to binary-mode and back). Now I'm using test-mode.

Now my script fails on a diff command. And to my surprise I can't find "diff" in my cygwin-folder.
Shouldn't it be there ??