diff --git a/CREDITS.txt b/CREDITS.txt
index 493fd260a..c5c876d29 100644
--- a/CREDITS.txt
+++ b/CREDITS.txt
@@ -1490,3 +1490,4 @@ Ernst Camenzind
 Steve Robbins
 Jean Noel Berlan
 Walter Szempruch
+Petr Kysela