diff --git a/Doc/ACKS b/Doc/ACKS
index ac84349..9f16780 100644
--- a/Doc/ACKS
+++ b/Doc/ACKS
@@ -144,6 +144,7 @@
 Greg Stein
 Peter Stoehr
 Mark Summerfield
+Reuben Sumner
 Martijn Vries
 Charles G. Waldman
 Greg Ward