For the exec-free var bug.
diff --git a/Misc/ACKS b/Misc/ACKS
index b416453..1ebf774 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -477,6 +477,7 @@
 Ka-Ping Yee
 Bob Yodlowski
 Masazumi Yoshikawa
+Danny Yoo
 Moshe Zadka
 Milan Zamazal
 Mike Zarnstorff