diff --git a/Misc/ACKS b/Misc/ACKS
index b6c8089..97fef3d 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -803,6 +803,7 @@
 Lars Wirzenius
 Chris Withers
 Stefan Witzel
+Irek Wlizlo
 David Wolever
 Klaus-Juergen Wolf
 Dan Wolfe