diff --git a/combineAndAnnotateReferences.pl b/combineAndAnnotateReferences.pl
index 485c189..e8585dc 100644
--- a/combineAndAnnotateReferences.pl
+++ b/combineAndAnnotateReferences.pl
@@ -123,7 +123,7 @@
 	{
 		my $thisNode_rank = $taxonomy_href->{$taxonID}{rank};
 		die unless(defined $thisNode_rank);
-		unless(($thisNode_rank eq 'species') or ($thisNode_rank eq 'no rank') or ($thisNode_rank eq 'subspecies') or ($thisNode_rank eq 'varietas'))
+		unless(($thisNode_rank eq 'species') or ($thisNode_rank eq 'no rank') or ($thisNode_rank eq 'subspecies') or ($thisNode_rank eq 'varietas') or ($thisNode_rank eq 'strain') or ($thisNode_rank eq 'isolate'))
 		{
 			die Dumper("Unexpected rank", $thisNode_rank, $taxonID, $taxonID_2_files{$taxonID});
 		}	
@@ -247,4 +247,4 @@ sub print_help
 );
  
 exit; 
-}
\ No newline at end of file
+}