diff --git a/History.md b/History.md
index 718e3b1c..8d09ce9f 100644
--- a/History.md
+++ b/History.md
@@ -12,6 +12,7 @@
 - #775
 - #802
 - #809
+- #812
 
 
 2.16.3
diff --git a/library/src/main/java/org/mustangproject/FileAttachment.java b/library/src/main/java/org/mustangproject/FileAttachment.java
index ed1fe39f..99a60419 100644
--- a/library/src/main/java/org/mustangproject/FileAttachment.java
+++ b/library/src/main/java/org/mustangproject/FileAttachment.java
@@ -9,7 +9,7 @@ public class FileAttachment {
 
 	protected String filename;
 	protected String mimetype;
-	protected String relation;
+	protected String relation = "Unspecified";
 	protected String description;
 	protected byte[] data;
 
@@ -29,6 +29,13 @@ public class FileAttachment {
 		this.description = "Additional file attachment";
 	}
 
+	public FileAttachment(String filename, String mimetype, byte[] data) {
+		this.filename = filename;
+		this.mimetype = mimetype;
+		this.data = data;
+		this.description = "Additional file attachment";
+	}
+
 	public String getDescription() {
 		return description;
 	}
@@ -60,6 +67,28 @@ public class FileAttachment {
 		return relation;
 	}
 
+	/***
+	 * only needed when embedded in PDF described
+	 *
+	 * values
+	 * 	- Source shall be used if this file specification is the original
+	 * source material for the associated content.
+	 * 	- Data shall be used if this file specification represents information
+	 * used to derive a visual presentation, such as for a table or a
+	 * graph.
+	 * 	- Alternative shall be used if this file specification is an alternative
+	 * representation of content, for example audio.
+	 * 	- Supplement shall be used if this file specification represents a
+	 * supplemental representation of the original source or data that
+	 * may be more easily consumable (e.g. A MathML version of an
+	 * equation).
+	 * 	- Unspecified shall be used when the relationship is not known
+	 * or cannot be described using one of the other values.
+	 * @param relation String: either : Source, Data or Alternative. Usually Data, except source if the file attachment
+	 *                    is the basis for the pdf (xrechnung2fx) or Alternative if it contains the same content (e.g. the
+	 *                 factur-x.xml file in a factur-x PDF)
+	 * @return fluent setter
+	 */
 	public FileAttachment setRelation(String relation) {
 		this.relation = relation;
 		return this;