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diff --git a/yarrg/web/docs b/yarrg/web/docs
index 2be018e..10caaee 100755
--- a/yarrg/web/docs
+++ b/yarrg/web/docs
@@ -178,6 +178,37 @@ You can enter the value in the box either as a percentage, or as a
 fraction 1/<em>divisor</em>, eg 1/2000 is the same as 0.05%; in each
 case it is taken as the loss for each league of the voyage.
 
+<h3><a name="minprofit">Minimum trade value</a></h3>
+
+Often there are many low-volume, low-value trades.  It can be rather
+labour-intensive to buy and sell a dozen different commodities, half
+of which are only making a few poe each.
+
+<p>
+
+The "minimum trade value" specifies a minimum profit that you would
+like to get from each (commodity, collect island, deliver island)
+triplet.  Trades which don't meet this minimum will start out unticked in
+the "Relevant trades" table and will not be included in the voyage
+trading plan.
+
+<p>
+
+If you want to change your threshold, you have to select "Apply",
+which will automatically tick and untick all of the tickboxes for in
+"Relevant trades", as appropriate.  This will undo any customisation
+of the set of trades you have already done by manually ticking and
+unticking individual trades.
+
+<p>
+
+The value is an absolute poe amount, typically 5 or 10, representing
+the minimum profit to make it worthwhile (from a time and effort point
+of view) clicking in the YPP client to collect and deliver a
+commodity.  Setting a higher threshold will make each island visit
+faster, by excluding trivial transactions, and so reduce the chance
+that market conditions change adversely during your voyage.
+
 <h3><a name="poelimit">Caution about stalls' poe reserves</a></h3>
 
 If you select <b>Also be cautious about stalls' poe reserves</b>,