Add some remarks about memcache and Yioop a=chris

diff --git a/en-US/pages/documentation.thtml b/en-US/pages/documentation.thtml
index fae23ae..64207bd 100755
--- a/en-US/pages/documentation.thtml
+++ b/en-US/pages/documentation.thtml
@@ -400,6 +400,14 @@ http://127.0.0.1/path_to_yioop/, where you appropriate modify
 <li>Otherwise, if you are doing a crawl on multiple machines, put
 the url to the machine that will act as the queue_server.</li>
 </ol>
+<p>In communicating between the fetcher and the server, Yioop! uses
+curl. Curl can be particular about redirects in the case where posted
+data is involved. i.e., if a redirect happens, it does not send posted
+data to the redirected site. So please be careful to include a trailing
+slash if appropriate in your queue server url. Beneath the Queue Server Url
+field, is a Memcached checkbox. Checking this allows you to specify
+memcache servers that, if specified, will be used to cache in memory search
+query results as well as index pages that have been accessed.</p>
 <p>
 The last fieldset is the <b>Crawl Robot Set-up</b> fieldset. This is used
 to provide websites that you crawl with information about who is crawling them.