diff --git a/Algo/Courses/Chapter 6 - Lists (Exercises).md b/Algo/Courses/Chapter 6 - Lists (Exercises).md
index 37fa214..db3e4ee 100644
--- a/Algo/Courses/Chapter 6 - Lists (Exercises).md	
+++ b/Algo/Courses/Chapter 6 - Lists (Exercises).md	
@@ -148,3 +148,6 @@ let rec delete x = function
 		else 
 			e::delete x i
 ```
+
+## Exercise 3.3
+```Ocaml