diff --git a/README.md b/README.md
index 0babeff..a8f98e5 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,27 @@ A Parser for PHP written in Go inspired by [Nikic PHP Parser](https://github.com
 - Abstract syntax tree representation
 - Traversing AST
 
+## Example
+```Golang
+package main
+
+import (
+	"bytes"
+
+	"github.com/z7zmey/php-parser/parser"
+	"github.com/z7zmey/php-parser/visitor"
+)
+
+func main() {
+	src := `<? echo "Hello world";`
+	nodes, comments, positions := parser.Parse(bytes.NewBufferString(src), "example.php")
+
+	visitor := visitor.Dumper{"  | ", comments, positions}
+	nodes.Walk(visitor)
+}
+
+```
+
 ## Roadmap
 - [X] Lexer
 - [x] PHP 7 syntax analyzer (completely)
diff --git a/dumper.go b/dumper.go
deleted file mode 100644
index 85ff45f..0000000
--- a/dumper.go
+++ /dev/null
@@ -1,47 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"reflect"
-
-	"github.com/z7zmey/php-parser/position"
-
-	"github.com/z7zmey/php-parser/comment"
-	"github.com/z7zmey/php-parser/node"
-)
-
-type dumper struct {
-	indent    string
-	comments  comment.Comments
-	positions position.Positions
-}
-
-func (d dumper) EnterNode(n node.Node) bool {
-
-	fmt.Printf("%v%v", d.indent, reflect.TypeOf(n))
-	if p := d.positions[n]; p != nil {
-		fmt.Printf(" %v", *p)
-	}
-	if a := n.Attributes(); len(a) > 0 {
-		fmt.Printf(" %v", a)
-	}
-	fmt.Println()
-
-	if c := d.comments[n]; len(c) > 0 {
-		fmt.Printf("%vcomments:\n", d.indent+"  ")
-		for _, cc := range c {
-			fmt.Printf("%v%q\n", d.indent+"    ", cc)
-		}
-	}
-
-	return true
-}
-
-func (d dumper) GetChildrenVisitor(key string) node.Visitor {
-	fmt.Printf("%v%q:\n", d.indent+"  ", key)
-	return dumper{d.indent + "    ", d.comments, d.positions}
-}
-
-func (d dumper) LeaveNode(n node.Node) {
-	// do nothing
-}
diff --git a/main.go b/main.go
index 55105a0..6e8e63a 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/yookoala/realpath"
 	"github.com/z7zmey/php-parser/parser"
+	"github.com/z7zmey/php-parser/visitor"
 )
 
 func main() {
@@ -25,7 +26,11 @@ func main() {
 				src, _ := os.Open(string(path))
 				nodes, comments, positions := parser.Parse(src, path)
 
-				visitor := dumper{"  | ", comments, positions}
+				visitor := visitor.Dumper{
+					Indent:    "  | ",
+					Comments:  comments,
+					Positions: positions,
+				}
 				nodes.Walk(visitor)
 			}
 			return nil
diff --git a/visitor/dumper.go b/visitor/dumper.go
new file mode 100644
index 0000000..1c81122
--- /dev/null
+++ b/visitor/dumper.go
@@ -0,0 +1,47 @@
+package visitor
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/z7zmey/php-parser/position"
+
+	"github.com/z7zmey/php-parser/comment"
+	"github.com/z7zmey/php-parser/node"
+)
+
+type Dumper struct {
+	Indent    string
+	Comments  comment.Comments
+	Positions position.Positions
+}
+
+func (d Dumper) EnterNode(n node.Node) bool {
+
+	fmt.Printf("%v%v", d.Indent, reflect.TypeOf(n))
+	if p := d.Positions[n]; p != nil {
+		fmt.Printf(" %v", *p)
+	}
+	if a := n.Attributes(); len(a) > 0 {
+		fmt.Printf(" %v", a)
+	}
+	fmt.Println()
+
+	if c := d.Comments[n]; len(c) > 0 {
+		fmt.Printf("%vComments:\n", d.Indent+"  ")
+		for _, cc := range c {
+			fmt.Printf("%v%q\n", d.Indent+"    ", cc)
+		}
+	}
+
+	return true
+}
+
+func (d Dumper) GetChildrenVisitor(key string) node.Visitor {
+	fmt.Printf("%v%q:\n", d.Indent+"  ", key)
+	return Dumper{d.Indent + "    ", d.Comments, d.Positions}
+}
+
+func (d Dumper) LeaveNode(n node.Node) {
+	// do nothing
+}