-The current official version of YARRG for use as an upload
-client can browsed here:
- <a href="/~ijackson/ypp-sc-tools/master/">http://www.chiark.greenend.org.uk/~ijackson/ypp-sc-tools/master/</a>
-See particularly the
-<a href="/~ijackson/ypp-sc-tools/master/yarrg/README">YARRG README</a>.
+(An exception to this is if you select the `Update' option from the
+`Trades for route' lookup; the list of (de)selected stalls is too long
+to fit in a URL.)
+
+<h2>Dynamic confirmation of meaning of text entry boxes</h2>
+
+If you have Javascript enabled, the various text entry boxes will be
+annotated with a brief explanation of the system's interpretation of
+your current entry string. To get the actual results updated, you
+must still hit `Go' or `Update'.
+
+<h2>Trades for route</h2>
+
+Given a list of islands (or archipelagoes), provides a list of
+potentially profitable trades. If the route is suitable for the trade
+route optimiser, it will generate a complete voyage plan, telling you
+which goods to buy and sell where at which stalls and prices.
+
+<p><a name="arbitrage"></a>
+
+If you specify only one island or one archipelago, the site shows only
+arbitrage trades. If you want single-hop trades within an
+archipelago, you must enter the archipelago name twice.