Added docs about built-in time zone support

assuming proper ISO 8601 timestamps

index.html

@@ -159,6 +159,16 @@ jQuery(document).ready(function() {
   jQuery("time.timeago").timeago();
 });</pre>
 
+      <p>
+        Are you concerned about time zone support? Don't be. Timeago handles
+        this too. As long as your timestamps are
+        in <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a> format
+        and include a
+        full <a href="http://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators">time
+        zone designator</a> (±hhmm), everything should work out of the box
+        regardless of the time zone that your visitors live in.
+      </p>
+
       <h3>Huh?</h3>
       <p class="last">
         Need a Rails helper to make those fancy microformat <tt>abbr</tt> tags?  Fine, here ya go: