diff --git a/Doc/ACKS b/Doc/ACKS
index f8a2b2e8eb0..5f4e57dc1a7 100644
--- a/Doc/ACKS
+++ b/Doc/ACKS
@@ -59,6 +59,7 @@ Magnus L. Hetland
 Konrad Hinsen
 Stefan Hoffmeister
 Albert Hofkamp
+Gregor Hoffleit
 Gerrit Holl
 Rob Hooft
 Brian Hooper
@@ -102,6 +103,7 @@ Skip Montanaro
 Ross Moore
 Sjoerd Mullender
 Dale Nagata
+Ng Pheng Siong
 Koray Oner
 Denis S. Otkidach
 William Park