diff --git a/README.md b/README.md
index ecd7adf..8882ad8 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,47 @@
 # go-dkim
-DKIM package for golang
+DKIM package for Golang
 
-## RFCs
-[5585](http://dkim.org/specs/rfc5585.html)
-[5617](http://www.rfc-editor.org/rfc/rfc5617.txt)
-[6376](http://tools.ietf.org/html/rfc6376)
+## Getting started
+
+### Install
+```
+ 	go get https://github.com/toorop/go-dkim
+```
+### Sign email
+
+```go
+import (
+	dkim "github.com/toorop/go-dkim"
+)
+
+func main(){
+	// email is the email to sign (byte slice)
+	// privateKey the private key (pem encoded, byte slice )	
+	options := dkim.NewSigOptions()
+	options.PrivateKey = privateKey
+	options.Domain = "mydomain.tld"
+	options.Selector = "myselector"
+	options.SignatureExpireIn = 3600
+	options.BodyLength = 50
+	options.Headers = []string{"from", "date", "mime-version", "received", "received"}
+	options.AddSignatureTimestamp = true
+	options.Canonicalization = "relaxed/relaxed"
+	err := dkim.Sign(&email, options)
+	// handle err..
+
+	// And... that's it, 'email' is now signed ! Amazing© !!!
+}
+```
+
+### Verify
+```go
+import (
+	dkim "github.com/toorop/go-dkim"
+)
+
+func main(){
+	// email is the email to verify (byte slice)
+	status, err := Verify(&email)
+	// handle status, err
+}
+```
\ No newline at end of file
diff --git a/dkim.go b/dkim.go
index 82f3707..94388e9 100644
--- a/dkim.go
+++ b/dkim.go
@@ -43,7 +43,7 @@ type sigOptions struct {
 	Version uint
 
 	// Private key used for signing (required)
-	PrivateKey string
+	PrivateKey []byte
 
 	// Domain (required)
 	Domain string
@@ -101,10 +101,10 @@ func Sign(email *[]byte, options sigOptions) error {
 	var privateKey *rsa.PrivateKey
 
 	// PrivateKey
-	if options.PrivateKey == "" {
+	if len(options.PrivateKey) == 0 {
 		return ErrSignPrivateKeyRequired
 	}
-	d, _ := pem.Decode([]byte(options.PrivateKey))
+	d, _ := pem.Decode(options.PrivateKey)
 	key, err := x509.ParsePKCS1PrivateKey(d.Bytes)
 	if err != nil {
 		return ErrCandNotParsePrivateKey
diff --git a/dkimHeader.go b/dkimHeader.go
index bdf8cc8..bab0839 100644
--- a/dkimHeader.go
+++ b/dkimHeader.go
@@ -2,7 +2,6 @@ package dkim
 
 import (
 	"bytes"
-	//"errors"
 	"fmt"
 	"net/mail"
 	"net/textproto"
diff --git a/dkim_test.go b/dkim_test.go
index 3f9cf36..ca1bb50 100644
--- a/dkim_test.go
+++ b/dkim_test.go
@@ -151,7 +151,7 @@ func Test_NewSigOptions(t *testing.T) {
 	assert.Equal(t, "simple/simple", options.Canonicalization)
 }
 
-/*func Test_SignConfig(t *testing.T) {
+func Test_SignConfig(t *testing.T) {
 	email := []byte(emailBase)
 	emailToTest := append([]byte(nil), email...)
 	options := NewSigOptions()
@@ -159,7 +159,7 @@ func Test_NewSigOptions(t *testing.T) {
 	assert.NotNil(t, err)
 	// && err No private key
 	assert.EqualError(t, err, ErrSignPrivateKeyRequired.Error())
-	options.PrivateKey = privKey
+	options.PrivateKey = []byte(privKey)
 	emailToTest = append([]byte(nil), email...)
 	err = Sign(&emailToTest, options)
 
@@ -217,7 +217,7 @@ func Test_canonicalize(t *testing.T) {
 	options.Headers = []string{"from", "date", "mime-version", "received", "received", "In-Reply-To"}
 	// simple/simple
 	options.Canonicalization = "simple/simple"
-	header, body, err := canonicalize(&emailToTest, options)
+	header, body, err := canonicalize(&emailToTest, options.Canonicalization, options.Headers)
 	assert.NoError(t, err)
 	assert.Equal(t, []byte(headerSimple), header)
 	assert.Equal(t, []byte(bodySimple), body)
@@ -225,18 +225,18 @@ func Test_canonicalize(t *testing.T) {
 	// relaxed/relaxed
 	emailToTest = append([]byte(nil), email...)
 	options.Canonicalization = "relaxed/relaxed"
-	header, body, err = canonicalize(&emailToTest, options)
+	header, body, err = canonicalize(&emailToTest, options.Canonicalization, options.Headers)
 	assert.NoError(t, err)
 	assert.Equal(t, []byte(headerRelaxed), header)
 	assert.Equal(t, []byte(bodyRelaxed), body)
 
 }
-*/
+
 func Test_Sign(t *testing.T) {
 	email := []byte(emailBase)
 	emailRelaxed := append([]byte(nil), email...)
 	options := NewSigOptions()
-	options.PrivateKey = privKey
+	options.PrivateKey = []byte(privKey)
 	options.Domain = domain
 	options.Selector = selector
 	//options.SignatureExpireIn = 3600
@@ -252,8 +252,6 @@ func Test_Sign(t *testing.T) {
 	emailSimple := append([]byte(nil), email...)
 	err = Sign(&emailSimple, options)
 	assert.Equal(t, []byte(signedSimpleSimple), emailSimple)
-	//fmt.Println(signedSimpleSimple)
-	//fmt.Println(string(emailSimple))
 
 }