diff --git a/docs/v4/3.XMLBuilder.md b/docs/v4/3.XMLBuilder.md
index afa72091..035dc83e 100644
--- a/docs/v4/3.XMLBuilder.md
+++ b/docs/v4/3.XMLBuilder.md
@@ -56,6 +56,7 @@ To recognize attribute properties in the JS object so that they can be trimmed.
 ## attributesGroupName
 To recognize attribute properties group in the JS object so that they can be trimmed and can form attribute expresstion for a tag.
 
+This property is not supported when  `preserveOrder: true` because attributes are already grouped.
 ## attributeValueProcessor
 To customize the bahaviour of parsing an attribute value to the string value. It accepts attribute name and value.