diff --git a/Misc/ACKS b/Misc/ACKS
index bb00e0f..e7ec4ca 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -591,6 +591,7 @@
 Piet van Oostrum
 Jason Orendorff
 Douglas Orr
+Michele Orrù
 Denis S. Otkidach
 Michael Otteneder
 R. M. Oudkerk