diff --git a/Misc/ACKS b/Misc/ACKS
index dbc86df..7f6e3db 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -531,6 +531,7 @@
 Zach Pincus
 Michael Piotrowski
 Antoine Pitrou
+Guilherme Polo
 Michael Pomraning
 Iustin Pop
 John Popplewell