diff --git a/_episodes/01-short-introduction-to-Python.md b/_episodes/01-short-introduction-to-Python.md
index d57833ea2..7e00d021a 100644
--- a/_episodes/01-short-introduction-to-Python.md
+++ b/_episodes/01-short-introduction-to-Python.md
@@ -360,6 +360,9 @@ a_list = [1, 2, 3]
 > 1. What happens when you execute `a_list[1] = 5`?
 > 2. What happens when you execute `a_tuple[2] = 5`?
 > 3. What does `type(a_tuple)` tell you about `a_tuple`?
+> 4. What information does the built-in function `len()` provide?
+     Does it provide the same information on both tuples and lists?
+     Does the `help()` function confirm this?
 {: .challenge}