diff --git a/docs/Contributors.txt b/docs/Contributors.txt
index 7aaf25ebab..bb57a77daa 100644
--- a/docs/Contributors.txt
+++ b/docs/Contributors.txt
@@ -52,6 +52,7 @@ Graeme Geldenhuys
 Grzegorz Zakrzewski
 Hakan Kizilhan
 Hans-Joachim Ott
+Hans-Peter Diettrich
 Henry Vermaak
 Hwang Weng Sun
 Ido Kanner