diff --git a/cmd/catalog.go b/cmd/catalog.go
index 955d349..af1010e 100644
--- a/cmd/catalog.go
+++ b/cmd/catalog.go
@@ -8,7 +8,7 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/zellyn/diskii/lib/disk"
-	_ "github.com/zellyn/diskii/lib/dos33"
+	_ "github.com/zellyn/diskii/lib/dos3"
 	_ "github.com/zellyn/diskii/lib/supermon"
 )
 
diff --git a/cmd/dump.go b/cmd/dump.go
index 255c79a..9955671 100644
--- a/cmd/dump.go
+++ b/cmd/dump.go
@@ -8,7 +8,7 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/zellyn/diskii/lib/disk"
-	_ "github.com/zellyn/diskii/lib/dos33"
+	_ "github.com/zellyn/diskii/lib/dos3"
 	_ "github.com/zellyn/diskii/lib/supermon"
 )
 
diff --git a/lib/dos33/dos33.go b/lib/dos3/dos3.go
similarity index 98%
rename from lib/dos33/dos33.go
rename to lib/dos3/dos3.go
index d5b1077..bba0c28 100644
--- a/lib/dos33/dos33.go
+++ b/lib/dos3/dos3.go
@@ -1,7 +1,8 @@
 // Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
 
-// Package dos33 contains routines for working with the on-disk structures of DOS 3.3.
-package dos33
+// Package dos3 contains routines for working with the on-disk
+// structures of Apple DOS 3.
+package dos3
 
 import (
 	"encoding/binary"
@@ -465,8 +466,8 @@ type operator struct {
 var _ disk.Operator = operator{}
 
 // operatorName is the keyword name for the operator that undestands
-// dos33 disks.
-const operatorName = "dos33"
+// dos3 disks.
+const operatorName = "dos3"
 
 // Name returns the name of the operator.
 func (o operator) Name() string {
@@ -504,7 +505,7 @@ func (o operator) GetFile(filename string) (disk.FileInfo, error) {
 	return disk.FileInfo{}, fmt.Errorf("%s does not yet implement `GetFile`", operatorName)
 }
 
-// operatorFactory is the factory that returns dos33 operators given
+// operatorFactory is the factory that returns dos3 operators given
 // disk images.
 func operatorFactory(sd disk.SectorDisk) (disk.Operator, error) {
 	lsd, err := disk.NewMappedDisk(sd, disk.Dos33LogicalToPhysicalSectorMap)
diff --git a/lib/dos33/dos33_test.go b/lib/dos3/dos3_test.go
similarity index 99%
rename from lib/dos33/dos33_test.go
rename to lib/dos3/dos3_test.go
index 5bf6ff9..2ce1d04 100644
--- a/lib/dos33/dos33_test.go
+++ b/lib/dos3/dos3_test.go
@@ -1,4 +1,4 @@
-package dos33
+package dos3
 
 import (
 	"crypto/rand"
diff --git a/lib/dos33/testdata/dos33test.dsk b/lib/dos3/testdata/dos33test.dsk
similarity index 100%
rename from lib/dos33/testdata/dos33test.dsk
rename to lib/dos3/testdata/dos33test.dsk
diff --git a/lib/supermon/supermon.go b/lib/supermon/supermon.go
index 102fce9..23c160a 100644
--- a/lib/supermon/supermon.go
+++ b/lib/supermon/supermon.go
@@ -325,8 +325,8 @@ func (o operator) GetFile(filename string) (disk.FileInfo, error) {
 	}, nil
 }
 
-// operatorFactory is the factory that returns dos33 operators given
-// disk images.
+// operatorFactory is the factory that returns supermon operators
+// given disk images.
 func operatorFactory(sd disk.SectorDisk) (disk.Operator, error) {
 	sm, err := LoadSectorMap(sd)
 	if err != nil {