diff --git a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporter.java b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporter.java
index f5b97613..7411d388 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporter.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporter.java
@@ -112,6 +112,9 @@ public class ZUGFeRDExporter implements Closeable {
 	protected boolean ensurePDFisUpgraded = true;
 	private PDDocument doc;
 	int ZFVersion;
+	
+	private HashMap<String,byte[]> additionalXMLs=new HashMap<String,byte[]>();
+
 
 	private boolean disableAutoClose;
 
@@ -128,6 +131,10 @@ public class ZUGFeRDExporter implements Closeable {
 		doc = doc2;
 		init();
 	}
+	
+	public void addAdditonalXML(String filename, byte[] xml) {
+		additionalXMLs.put(filename, xml);
+	}
 
 	public static String getNamespaceForVersion(int ver) {
 		if (ver == 1) {
@@ -340,6 +347,9 @@ public class ZUGFeRDExporter implements Closeable {
 			
 			
 		}
+		for (String filenameAdditional : additionalXMLs.keySet()) {
+			PDFAttachGenericFile(doc, filenameAdditional, "Supplement", "ZUGFeRD extension/additional data", "text/xml", additionalXMLs.get(filenameAdditional));
+		}
 	}
 
 	public void export(String ZUGFeRDfilename) throws IOException {
@@ -459,6 +469,7 @@ public class ZUGFeRDExporter implements Closeable {
 		cus.setXML(zugferdData);
 		this.xmlProvider = cus;
 		PDFattachZugferdFile(null);
+		
 	}
 
 	/**
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3Factory.java b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3Factory.java
index ac9b2c43..dd06cd29 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3Factory.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3Factory.java
@@ -23,6 +23,8 @@ import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.HashMap;
+
 import javax.activation.DataSource;
 import javax.activation.FileDataSource;
 import org.apache.pdfbox.io.IOUtils;
@@ -42,7 +44,10 @@ public class ZUGFeRDExporterFromA3Factory implements IExporterFactory {
 	protected String creator = "mustangproject";
 	/** Creator tool (attribute for PDF) */
 	protected String creatorTool = null;
+	
+	private HashMap<String,byte[]> additionalXMLs=new HashMap<String,byte[]>();
 
+	
 	protected int ZFVersion=ZUGFeRDExporter.DefaultZUGFeRDVersion;
 	protected boolean ensurePDFisUpgraded=false;
 	private boolean attachZUGFeRDHeaders=true;
@@ -123,7 +128,7 @@ public class ZUGFeRDExporterFromA3Factory implements IExporterFactory {
 		IOUtils.copy(in, buffer);
 		return buffer.toByteArray();
 	}
-		private static boolean isValidA1(DataSource dataSource) throws IOException {
+	private static boolean isValidA1(DataSource dataSource) throws IOException {
 		return getPDFAParserValidationResult(new PreflightParser(dataSource));
 	}
 
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
index b71f4b1f..bf76a855 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDImporter.java
@@ -31,6 +31,7 @@ import java.io.ByteArrayInputStream;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.logging.Logger;
@@ -67,6 +68,7 @@ public class ZUGFeRDImporter {
 	private String holder;
 	private String amount;
 	private String dueDate;
+	private HashMap<String,byte[]> additionalXMLs=new HashMap<String,byte[]>();
 	/** Raw XML form of the extracted data - may be directly obtained. */
 	private byte[] rawXML = null;
 	private String bankName;
@@ -151,7 +153,6 @@ public class ZUGFeRDImporter {
 	
 	private void extractFiles(Map<String, PDComplexFileSpecification> names) throws IOException {
 		for (String filename : names.keySet()) {
-
 			/**
 			 * currently (in the release candidate of version 1) only one attached file with
 			 * the name ZUGFeRD-invoice.xml is allowed
@@ -174,8 +175,19 @@ public class ZUGFeRDImporter {
 				// fos.write(embeddedFile.getByteArray());
 				// fos.close();
 			}
+			if (filename.startsWith("additional_data")) {
+
+				PDComplexFileSpecification fileSpec = names.get(filename);
+				PDEmbeddedFile embeddedFile = fileSpec.getEmbeddedFile();
+				additionalXMLs.put(filename, embeddedFile.toByteArray());
+
+			}
 		}
 	}
+	
+	public HashMap<String, byte[]> getAdditionalData() {
+		return additionalXMLs;
+	}
 
 	/**
 	 * needs to be called to be able to call the getters