diff --git a/share/tryton/contributors.txt b/share/tryton/contributors.txt
index a68bf1ce19..c52b7a6e18 100644
--- a/share/tryton/contributors.txt
+++ b/share/tryton/contributors.txt
@@ -1,2 +1,7 @@
 Cédric Krier
 Bertrand Chenal
+Udo Spallek
+Korbinian Preisler
+Hartmut Goebel
+Franz Wiesinger
+Mathias Behrle