diff --git a/Doc/ACKS b/Doc/ACKS
index c23c3da..385b5f1 100644
--- a/Doc/ACKS
+++ b/Doc/ACKS
@@ -61,6 +61,7 @@
 Jonathan Giddy
 Nathaniel Gray
 Grant Griffin
+Thomas Guettler
 Anders Hammarquist
 Mark Hammond
 Harald Hanche-Olsen