diff --git a/journal_de_bord.md b/journal_de_bord.md
index a32251a786c4dbfb0fd4cd4e8af35b95bc900baa..b1fc80a26ccd922e97822c28afbe8221d5855793 100644
--- a/journal_de_bord.md
+++ b/journal_de_bord.md
@@ -39,7 +39,17 @@ Une ligne de `code`
 
 ## module2
 
-## exo1:
-from math import *
-print(pi)
+## exo1: on trouve tout dans jupyter module 2
 
+1. On the computation of π 
+2. Buffon’s needle
+
+Applying the method of Buffon’s needle, we get the approximation for pi in our case
+3. Using a surface fraction argument
+
+A method that is easier to understand and does not make use of the sin function is based on the fact that if X ∼ U(0, 1) and Y ∼ U(0, 1), then P[X2 + Y2 ≤ 1] = π/4 . The following code uses this approach:
+
+4. Écrire le lien "aiguilles de Buffon" vers wikipedia
+
+5. Écrire le code de la méthode de Buffon pour Python et pour R
+6. ECRIRE DANS LE LANGUAGE R