diff --git a/src/main/java/PDLayer.mdl b/src/main/java/PDLayer.mdl
index a21bbb3..a6362c8 100644
--- a/src/main/java/PDLayer.mdl
+++ b/src/main/java/PDLayer.mdl
@@ -654,6 +654,11 @@ type PDSoundAnnot extends PDAnnot {
 type PDTrapNetAnnot extends PDAnnot {
 }
 
+% watermark annotation
+type PDWatermarkAnnot extends PDAnnot {
+}
+
+
 % widget annotation
 type PDWidgetAnnot extends PDAnnot {
 	% the value of the /TU entry (Field type), in case this is the widget annotation representing the form field,