diff --git a/cyberiadaml.c b/cyberiadaml.c
index b642b3d..eb17af0 100644
--- a/cyberiadaml.c
+++ b/cyberiadaml.c
@@ -4111,6 +4111,10 @@ static int cyberiada_write_sm_cyberiada(CyberiadaSM* sm, xmlTextWriterPtr writer
 	XML_WRITE_ATTR(writer, GRAPHML_ID_ATTRIBUTE, sm->nodes->id);
 	XML_WRITE_ATTR(writer, GRAPHML_EDGEDEFAULT_ATTRIBUTE, GRAPHML_EDGEDEFAULT_ATTRIBUTE_VALUE);
 
+	XML_WRITE_OPEN_E_I(writer, GRAPHML_DATA_ELEMENT, 2);
+	XML_WRITE_ATTR(writer, GRAPHML_KEY_ATTRIBUTE, GRAPHML_CYB_KEY_STATE_MACHINE);
+	XML_WRITE_CLOSE_E(writer);
+	
 	XML_WRITE_OPEN_E_I(writer, GRAPHML_DATA_ELEMENT, 2);
 	XML_WRITE_ATTR(writer, GRAPHML_KEY_ATTRIBUTE, GRAPHML_CYB_KEY_NAME);
 	XML_WRITE_TEXT(writer, sm->nodes->title);