diff --git a/Misc/ACKS b/Misc/ACKS
index b69028b..c065f7b 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -535,6 +535,7 @@
 Zack Weinberg
 Edward Welbourne
 Rickard Westman
+Mats Wichmann
 Truida Wiedijk
 Gerry Wiener
 Bryce "Zooko" Wilcox-O'Hearn