diff --git a/CREDITS.txt b/CREDITS.txt
index 0fd19015e..52ec9a9a8 100644
--- a/CREDITS.txt
+++ b/CREDITS.txt
@@ -1742,3 +1742,8 @@ Stefano Bortolotti
 Gerald Zierer
 Alessio Noto
 Walter Fowler
+Robert Black
+Klaus Kernstock
+Michael Wittich
+AG-Software
+Dietmar Drees