diff --git a/Algo/CM/Lists.md b/Algo/CM/Lists.md
index 88e6e1f..6b9b614 100644
--- a/Algo/CM/Lists.md
+++ b/Algo/CM/Lists.md
@@ -42,3 +42,13 @@ WITH
 `first`return the first element of the list (is equivalent to contents)
 `tail`remove the first element of the list (eg. fl <- tail (li))
 `next`return the element after a box (eg. pspt <= next(head(li))))
+
+## Array implementation
+Let's take a list l = E ; D ; C ; B ; A. An array implementation of the list l will be:
+
+|1|2|3|4|5|
+|:----:|:----:|:----:|:----:|:----:|
+|A|B|C|D|E|
+|5|
+
+The first line of the table is the $n^{th}$ place of the element, the second line is all the element of the list, and the third line is the place of the first element of the list (here E is at the $5^{th}$ position).