/// - We may want to support incremental loading.
/// - If we add these optional features we may want to introduce a class
/// that encapsulates loading status and options.
-/// - RRSIGs are handled separate RRsets, that is, not set within the RRset
-/// that they cover.
+/// - RRSIGs are handled as separate RRsets, i.e. they are not included in
+/// the RRset they cover.
///
/// \param filename A path to a master zone file to be loaded.
/// \param origin The origin name of the zone.