diff --git a/collects/drracket/acks.rkt b/collects/drracket/acks.rkt
index 6bd10ed990..3996c8d911 100644
--- a/collects/drracket/acks.rkt
+++ b/collects/drracket/acks.rkt
@@ -37,6 +37,7 @@
    "Dan Grossman, "
    "Arjun Guha, "
    "Dave Gurnell, "
+   "Tobias Hammer, "
    "Bruce Hauman, "
    "Dave Herman, "
    "Blake Johnson, "