diff --git a/Improving-performance-with-Viper-code.md b/Improving-performance-with-Viper-code.md
index 2aaf002..e76a3dd 100644
--- a/Improving-performance-with-Viper-code.md
+++ b/Improving-performance-with-Viper-code.md
@@ -331,7 +331,7 @@ You can assign to x[n], modifying the memory contents. There is no bounds checki
 ```py
 @micropython.viper
 def myfunction( x:ptr32, b:bool )->int:
-    print(x[0], x[1], x[2] ) # will print 1, 2, 3, 4
+    print(x[0], x[1], x[2] ) # will print 1, 2, 3
     return x[1]
 myfunction( array.array("l", (1,2,3,4)))