Given a MARC::Record object containing an embedded item
record and a biblionumber, create a new item record.
-The final optional parameter, C<$params>, expected to contain
+The final optional parameter, C<$params>, may contain
'skip_record_index' key, which relayed down to Koha::Item/store,
there it prevents calling of index_records,
which takes most of the time in batch adds/deletes: index_records
to be called later in C<additem.pl> after the whole loop.
+You may also optionally pass biblioitemnumber in the params hash to
+boost performance of inserts by preventing a lookup in Koha::Item.
+
$params:
skip_record_index => 1|0
+ biblioitemnumber => $biblioitemnumber
=cut