+After getting the results, you can untick various trades individually,
+and select `Update' to get a new plan. The unticked trades will be
+excluded from the voyage plan (if any) and also from the totals.
+
+<h3><a name="capacity">Vessel capacity</a></h3>
+
+If you don't specify a vessel or a vessel capacity, the trading plan
+will not take into account the fact that your voyage will be on a ship
+with a limited size. This will probably result in a plan
+which trades excessively cumbersome goods (eg. hemp, wood, iron).
+
+<p>
+
+So you should specify your vessel capacity. You can enter things
+like:
+<dl>
+<dt>sloop
+<dd>The capacity of a sloop, leaving no allowance for rum and shot
+<dt>wb - 1%
+<dd>The capacity of a war brig minus 1%
+<dt>13t 20kl
+<dd>13 tonnes (13,000kg), 20 kilolitres (20,000l)
+<dt>sloop - 10 small 40 rum
+<dd>The capacity of a sloop which remains after
+ 10 small shot and 40 rum are loaded
+<dt>2t plus 500kg minus 200kg
+<dd>2300kg, with no limit on volume
+</dl>
+Evaluation is strictly from left to right.
+
+<p>
+
+More formally: