diff --git a/compressionoptions.go b/compressionoptions.go
index 06ed4f5..65e604b 100644
--- a/compressionoptions.go
+++ b/compressionoptions.go
@@ -1,6 +1,6 @@
 package squashfs
 
-//CompressionOptions
+//TODO: implement decompress for each type of Options
 type CompressionOptions interface {
 	Decompress([]byte) []byte
 }
diff --git a/unsquash.go b/unsquash.go
index 0a41480..bcc3c20 100644
--- a/unsquash.go
+++ b/unsquash.go
@@ -7,17 +7,19 @@ import (
 
 //Squashfs is a squashfs backed by a ReadSeeker.
 type Squashfs struct {
-	rdr   *io.ReaderAt //underlying reader
+	rdr   *io.ReadSeeker //underlying reader
 	super Superblock
 }
 
 //NewSquashfs creates a new Squashfs backed by the given reader
-func NewSquashfs(reader io.ReaderAt) (*Squashfs, error) {
+func NewSquashfs(reader io.ReadSeeker) (*Squashfs, error) {
 	var superblock Superblock
-	err := binary.Read(io.NewSectionReader(reader, 0, int64(binary.Size(superblock))), binary.LittleEndian, &superblock)
+	err := binary.Read(reader, binary.LittleEndian, &superblock)
 	if err != nil {
 		return nil, err
 	}
+	//TODO: check magic
+	//TODO: parse more info
 	return &Squashfs{
 		rdr:   &reader,
 		super: superblock,