diff --git a/lib/supermon/supermon_test.go b/lib/supermon/supermon_test.go
index 06182f0..6dde6b7 100644
--- a/lib/supermon/supermon_test.go
+++ b/lib/supermon/supermon_test.go
@@ -47,6 +47,7 @@ func TestReadSectorMap(t *testing.T) {
 		{7, 0x1F, "FSHRTHELP"},
 		{8, 0x04, "FSHORT"},
 		{9, 0x60, "FCHACHA"},
+		{10, 0x01, "FTOBE"},
 	}
 
 	sectorsByFile := sm.SectorsByFile()
@@ -88,6 +89,7 @@ func TestReadSymbolTable(t *testing.T) {
 		{7, "FSHRTHELP"},
 		{8, "FSHORT"},
 		{9, "FCHACHA"},
+		{10, "FTOBE"},
 	}
 
 	for _, tt := range testData {
diff --git a/lib/supermon/testdata/chacha20.dsk b/lib/supermon/testdata/chacha20.dsk
index 38b831b..1f3b16e 100644
Binary files a/lib/supermon/testdata/chacha20.dsk and b/lib/supermon/testdata/chacha20.dsk differ