diff --git a/usr.sbin/daemon/daemon.c b/usr.sbin/daemon/daemon.c
index 341438730a6..9158d6404b2 100644
--- a/usr.sbin/daemon/daemon.c
+++ b/usr.sbin/daemon/daemon.c
@@ -194,6 +194,7 @@ main(int argc, char *argv[])
 
 	/*
 	 * Supervision mode is enabled if one of the following options are used:
+	 * --output-file -o
 	 * --child-pidfile -p
 	 * --supervisor-pidfile -P
 	 * --restart -r / --restart-delay -R