diff --git a/collects/drscheme/acks.ss b/collects/drscheme/acks.ss
index 71086880bb..2182f7d09d 100644
--- a/collects/drscheme/acks.ss
+++ b/collects/drscheme/acks.ss
@@ -54,6 +54,7 @@
      "Stephanie Weirich, "
      "Noel Welsh, "
      "Adam Wick, "
+     "Danny Yoo, "
      "and "
      "ChongKai Zhu."))