Add GHOP contributor.
diff --git a/Misc/ACKS b/Misc/ACKS
index 36b7d44..8b666d4 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -509,6 +509,7 @@
 Mark Perrego
 Trevor Perrin
 Tim Peters
+Benjamin Peterson
 Chris Petrilli
 Bjorn Pettersen
 Geoff Philbrick