diff --git a/src/demo.shy b/src/demo.shy
index aab1614e..eaeeaa50 100644
--- a/src/demo.shy
+++ b/src/demo.shy
@@ -1,6 +1,7 @@
 # demo script
 
 let a = system(ls bin)
+let a = system(ls, etc)
 return
 
 let a = 1