diff --git a/usr.sbin/mergemaster/mergemaster.8 b/usr.sbin/mergemaster/mergemaster.8
index 63cf2ab1ee8..1d7b2608f5a 100644
--- a/usr.sbin/mergemaster/mergemaster.8
+++ b/usr.sbin/mergemaster/mergemaster.8
@@ -312,6 +312,9 @@ with all values commented out:
 # Automatically install files that do not exist on the system already
 #AUTO_INSTALL=
 #
+# Automatically upgrade files that have not been user modified
+#AUTO_UPGRADE=
+#
 # Compare /etc/rc.conf[.local] to /etc/defaults/rc.conf
 #COMP_CONFS=yes
 #