diff --git a/docs/xrechnung.txt b/docs/xrechnung.txt
index 020bd2a..3cf8cff 100644
--- a/docs/xrechnung.txt
+++ b/docs/xrechnung.txt
@@ -6,3 +6,6 @@ https://github.com/itplr-kosit
 
 validator:
 - https://erechnungsvalidator.service-bw.de/
+
+überweisungsdaten
+https://portal3.gefeg.com/projectdata/invoice/deliverables/installed/publishingproject/zugferd%202.0.1%20-%20facturx%201.03/en%2016931%20%E2%80%93%20facturx%201.03%20%E2%80%93%20zugferd%202.0.1%20-%20basic.scm/html/de/021.htm?https://portal3.gefeg.com/projectdata/invoice/deliverables/installed/publishingproject/zugferd%202.0.1%20-%20facturx%201.03/en%2016931%20%E2%80%93%20facturx%201.03%20%E2%80%93%20zugferd%202.0.1%20-%20basic.scm/html/de/02134.htm