diff --git a/README.md b/README.md
index bd7104c..63c3268 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,13 @@
 [![pkg-img]][pkg-url]
 [![version-img]][version-url]
 
-BSON for Go.
+Package implements BSON encoding and decoding in Go. See https://bsonspec.org/spec.html
 
 ## Features
 
 * Simple API.
 * Dependency-free.
+* Optimized for speed.
 * Clean and tested code.
 
 See [docs][pkg-url] for more details.
diff --git a/bson.go b/bson.go
index 4ebc23f..9aacd66 100644
--- a/bson.go
+++ b/bson.go
@@ -11,7 +11,7 @@ type Marshaler interface {
 	MarshalBSON() ([]byte, error)
 }
 
-// Marshal returns bencode encoding of v.
+// Marshal returns BSON encoding of v.
 func Marshal(v any) ([]byte, error) {
 	buf := &bytes.Buffer{}
 	if err := NewEncoder(buf).Encode(v); err != nil {
@@ -20,6 +20,16 @@ func Marshal(v any) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
+// MarshalTo returns BSON encoding of v written to dst.
+func MarshalTo(dst []byte, v interface{}) ([]byte, error) {
+	buf := bytes.NewBuffer(dst)
+	enc := &Encoder{buf: buf}
+	if err := enc.marshal(v); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
 // Unmarshaler is the interface implemented by types that
 // can unmarshal a BSON representation of themselves.
 //
diff --git a/example_test.go b/example_test.go
index e5c75c2..abe4f1d 100644
--- a/example_test.go
+++ b/example_test.go
@@ -1,6 +1,11 @@
 package bson_test
 
-import "bson"
+import (
+	"encoding/hex"
+	"fmt"
+
+	"github.com/cristalhq/bson"
+)
 
 func Example_types() {
 	arr := bson.A{"a", "b", "c", 12345}
@@ -11,3 +16,33 @@ func Example_types() {
 
 	// Output:
 }
+
+func ExampleMarshal() {
+	arr := bson.A{"a", "b", "c"}
+
+	b, err := bson.Marshal(arr)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(hex.EncodeToString(b))
+
+	// Output:
+	// 2000000002300002000000610002310002000000620002320002000000630000
+}
+
+func ExampleMarshalTo() {
+	arr := bson.A{"a", "b", "c"}
+
+	buf := make([]byte, 0, 128)
+
+	buf, err := bson.MarshalTo(buf, arr)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(hex.EncodeToString(buf))
+
+	// Output:
+	// 2000000002300002000000610002310002000000620002320002000000630000
+}
diff --git a/go.mod b/go.mod
index 1aa38a8..712a449 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
-module bson
+module github.com/cristalhq/bson
 
 go 1.18