diff --git a/Misc/ACKS b/Misc/ACKS
index 552955c1cf3..5e82ffeb381 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -408,6 +408,7 @@ John Tromp
 Jason Trowbridge
 Stephen Turner
 Bill Tutt
+Lionel Ulmer
 Jaap Vermeulen
 Al Vezza
 John Viega