diff --git a/Prog/Array.md b/Prog/Array.md
index 6c32439..6cedbe8 100644
--- a/Prog/Array.md
+++ b/Prog/Array.md
@@ -3,8 +3,17 @@ An array is a vector in a collection
 To declare an array we use :
 ```csharp
 public static void Main() {
-	int[] vect = new int[4] // Declare a vector of 4 elements
-	vect[4] = 22;
+	int[] vect = new int[4] // Declare a vector of 4 elements (from 0 to 3)
+	vect[3] = 22;
+	Console.WriteLine($"b = {b}");
+	Console.WriteLine($"{vect[3]}");
 }
-
 ```
+
+The result will be:
+```bash
+b = 0
+22
+```
+
+We see that an array start from $0$ to $n-1$
\ No newline at end of file