@end example
@item
-Force the number of systems. For example, if the default layout
-has 11 systems, the following assignment will force a layout with
-10 systems.
+Force the number of systems. This can help in two ways. Just
+setting a value, even the same value as the number of systems
+being typeset by default, will sometimes cause more systems to
+be fitted onto each page, as an estimation step is then bypassed,
+giving a more accurate fit to each page. Also, forcing an actual
+reduction in the number of systems may save a further page. For
+example, if the default layout has 11 systems, the following
+assignment will force a layout with 10 systems.
@example
\paper @{