@code{#1}.
@item max-systems-per-page
+@funindex max-systems-per-page
+
The maximum number of systems that will be placed on a page. This
is currently supported only by the @code{ly:optimal-breaking} algorithm.
Default: unset.
@item min-systems-per-page
+@funindex min-systems-per-page
+
The minimum number of systems that will be placed on a page. This
may cause pages to be overfilled if it is made too large. This is
currently supported only by the @code{ly:optimal-breaking} algorithm.