diff --git a/library/pom.xml b/library/pom.xml
index baf48639..c7647f0a 100644
--- a/library/pom.xml
+++ b/library/pom.xml
@@ -157,15 +157,28 @@
 				</configuration>
 			</plugin>
 			<plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
-                <version>3.2.0</version>
-                <configuration>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>3.2.0</version>
+        <configuration>
 					<excludes>
 						<exclude>**/logback.xml</exclude>
 					</excludes>
-                </configuration>
-            </plugin>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <version>3.2.1</version>
+        <executions>
+          <execution>
+            <id>attach-sources</id>
+            <goals>
+              <goal>jar-no-fork</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-shade-plugin</artifactId>
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
index eea28b1b..c0c4b51c 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDInvoiceImporter.java
@@ -1,6 +1,7 @@
 package org.mustangproject.ZUGFeRD;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.nio.charset.StandardCharsets;
@@ -43,6 +44,10 @@ public ZUGFeRDInvoiceImporter(String filename) {
 		super(filename);
 	}
 
+	public ZUGFeRDInvoiceImporter(InputStream stream) {
+		super(stream);
+	}
+
 	public void fromXML(String XML) {
 		try {
 			containsMeta = true;