diff --git a/History.md b/History.md
index b590eee3..1696d46a 100644
--- a/History.md
+++ b/History.md
@@ -4,6 +4,7 @@
 - falscher Text in Exception #237
 - pr 240 ignore input pdf errors when specfied on command line https://github.com/ZUGFeRD/mustangproject/pull/240
 - pr 241 use sepa transfer instead of bank transfer https://github.com/ZUGFeRD/mustangproject/pull/241
+- be able to validate Order-X files
 
 2.1.1
 =======
diff --git a/validator/src/main/java/org/mustangproject/validator/PDFValidator.java b/validator/src/main/java/org/mustangproject/validator/PDFValidator.java
index 22877660..69499167 100644
--- a/validator/src/main/java/org/mustangproject/validator/PDFValidator.java
+++ b/validator/src/main/java/org/mustangproject/validator/PDFValidator.java
@@ -199,7 +199,7 @@ public class PDFValidator extends Validator {
 
 			boolean documentTypeValid=false;
 			for (int i = 0; i < nodes.getLength(); i++) {
-				if (nodes.item(i).getTextContent().equals("INVOICE")||nodes.item(i).getTextContent().equals("ORDER")) {
+				if (nodes.item(i).getTextContent().equals("INVOICE")||nodes.item(i).getTextContent().equals("ORDER")||nodes.item(i).getTextContent().equals("ORDER_RESPONSE")||nodes.item(i).getTextContent().equals("ORDER_CHANGE")) {
 					documentTypeValid=true;
 				}
 			}