diff --git a/copyright.txt b/copyright.txt
index 46dc97558..54a067a06 100644
--- a/copyright.txt
+++ b/copyright.txt
@@ -9,6 +9,7 @@ Dilip Krishnan
 Ewald Volkert
 Gunnar Morling
 Ivo Smid
+Markus Heberling
 Michael Pardo
 Mustafa Caylak
 Oliver Ehrenmüller