diff --git a/unixfs/io/bufdagreader.go b/unixfs/io/bufdagreader.go
index 8c6fd0cf8..6074099e8 100644
--- a/unixfs/io/bufdagreader.go
+++ b/unixfs/io/bufdagreader.go
@@ -6,27 +6,32 @@ import (
 	"io"
 )
 
-type bufDagReader struct {
+// BufDagReader implements a DagReader that reads from a byte slice
+// using a bytes.Reader. It is used for RawNodes.
+type BufDagReader struct {
 	*bytes.Reader
 }
 
-// newBufDagReader returns a DAG reader for the given byte slice.
+// NewBufDagReader returns a DAG reader for the given byte slice.
 // BufDagReader is used to read RawNodes.
-func newBufDagReader(b []byte) *bufDagReader {
-	return &bufDagReader{bytes.NewReader(b)}
+func NewBufDagReader(b []byte) *BufDagReader {
+	return &BufDagReader{bytes.NewReader(b)}
 }
 
-var _ DagReader = (*bufDagReader)(nil)
+var _ DagReader = (*BufDagReader)(nil)
 
-func (*bufDagReader) Close() error {
+// Close is a nop.
+func (*BufDagReader) Close() error {
 	return nil
 }
 
-func (rd *bufDagReader) CtxReadFull(ctx context.Context, b []byte) (int, error) {
+// CtxReadFull reads the slice onto b.
+func (rd *BufDagReader) CtxReadFull(ctx context.Context, b []byte) (int, error) {
 	return rd.Read(b)
 }
 
-func (rd *bufDagReader) Offset() int64 {
+// Offset returns the current offset.
+func (rd *BufDagReader) Offset() int64 {
 	of, err := rd.Seek(0, io.SeekCurrent)
 	if err != nil {
 		panic("this should never happen " + err.Error())
@@ -34,7 +39,8 @@ func (rd *bufDagReader) Offset() int64 {
 	return of
 }
 
-func (rd *bufDagReader) Size() uint64 {
+// Size returns the size of the buffer.
+func (rd *BufDagReader) Size() uint64 {
 	s := rd.Reader.Size()
 	if s < 0 {
 		panic("size smaller than 0 (impossible!!)")
diff --git a/unixfs/io/dagreader.go b/unixfs/io/dagreader.go
index 037e0a256..ec3b3e028 100644
--- a/unixfs/io/dagreader.go
+++ b/unixfs/io/dagreader.go
@@ -43,7 +43,7 @@ type ReadSeekCloser interface {
 func NewDagReader(ctx context.Context, n ipld.Node, serv ipld.NodeGetter) (DagReader, error) {
 	switch n := n.(type) {
 	case *mdag.RawNode:
-		return newBufDagReader(n.RawData()), nil
+		return NewBufDagReader(n.RawData()), nil
 	case *mdag.ProtoNode:
 		pb := new(ftpb.Data)
 		if err := proto.Unmarshal(n.Data(), pb); err != nil {
diff --git a/unixfs/io/pbdagreader.go b/unixfs/io/pbdagreader.go
index 4523481b3..ce3abf439 100644
--- a/unixfs/io/pbdagreader.go
+++ b/unixfs/io/pbdagreader.go
@@ -57,7 +57,7 @@ func NewPBFileReader(ctx context.Context, n *mdag.ProtoNode, pb *ftpb.Data, serv
 	return &PBDagReader{
 		node:     n,
 		serv:     serv,
-		buf:      newBufDagReader(pb.GetData()),
+		buf:      NewBufDagReader(pb.GetData()),
 		promises: make([]*ipld.NodePromise, len(curLinks)),
 		links:    curLinks,
 		ctx:      fctx,
@@ -119,7 +119,7 @@ func (dr *PBDagReader) precalcNextBuf(ctx context.Context) error {
 			dr.buf = NewPBFileReader(dr.ctx, nxt, pb, dr.serv)
 			return nil
 		case ftpb.Data_Raw:
-			dr.buf = newBufDagReader(pb.GetData())
+			dr.buf = NewBufDagReader(pb.GetData())
 			return nil
 		case ftpb.Data_Metadata:
 			return errors.New("shouldnt have had metadata object inside file")
@@ -256,7 +256,7 @@ func (dr *PBDagReader) Seek(offset int64, whence int) (int64, error) {
 			if dr.buf != nil {
 				dr.buf.Close()
 			}
-			dr.buf = newBufDagReader(pb.GetData()[offset:])
+			dr.buf = NewBufDagReader(pb.GetData()[offset:])
 
 			// start reading links from the beginning
 			dr.linkPosition = 0