diff --git a/stack.sh b/stack.sh
index 5e4a4f8..697dce1 100755
--- a/stack.sh
+++ b/stack.sh
@@ -136,7 +136,7 @@
 source $TOP_DIR/lib/stack
 
 # Determine what system we are running on.  This provides ``os_VENDOR``,
-# ``os_RELEASE``, ``os_UPDATE``, ``os_PACKAGE``, ``os_CODENAME``
+# ``os_RELEASE``, ``os_PACKAGE``, ``os_CODENAME``
 # and ``DISTRO``
 GetDistro