diff --git a/docs/v4/3.XMLBuilder.md b/docs/v4/3.XMLBuilder.md
index e2a1be0a..2d640714 100644
--- a/docs/v4/3.XMLBuilder.md
+++ b/docs/v4/3.XMLBuilder.md
@@ -295,7 +295,7 @@ const options = {
     unpairedTags: ["unpaired"]
 };
 const parser = new XMLParser(options);
-const result = parser.parse(xmlDataStr);
+const result = parser.parse(xmlData);
 
 const builder = new XMLBuilder(options);
 const output = builder.build(result);
@@ -462,4 +462,4 @@ Output
 
 
 
-[> Next: XmlValidator](./4.XMLValidator.md)
\ No newline at end of file
+[> Next: XmlValidator](./4.XMLValidator.md)