Added link to operating-systems.html from index page.

office/index.xml

@@ -17,10 +17,11 @@
   <p>
    One of our most popular services at the office is providing anybody
    with CD copies of Free Software and Open Source operating system
-   distributions (including, but by no means limited to, Debian
-   GNU/Linux, Mandrake Linux, Red Hat Linux, FreeBSD and NetBSD for
-   various architectures). The cost is $1.50 per CD at the time of
-   this writing, or <b>free</b> if you provide your own CDs.
+   distributions (including, but by no means limited to, Debian GNU/Linux,
+   Mandrake Linux, Red Hat Linux, FreeBSD and NetBSD for various
+   architectures. Please check <a href="operating-systems.html">here</a> for
+   a list of available operating systems.). The cost is $1.50 per CD at
+   the time of this writing, or <b>free</b> if you provide your own CDs.
   </p>
   <p>
    Another favourite is our $0.50 pop for members. We have a fridge in
@@ -36,4 +37,4 @@
  </section>
 
  <footer />
-</cscpage>
+</cscpage>