diff --git a/slides/cours_2.md b/slides/cours_2.md
index 99ba3e4106579ee6dc2ae3eca1d42e198c092d84..ae24e44ed5a47172370a135a8ca02a0769edb813 100644
--- a/slides/cours_2.md
+++ b/slides/cours_2.md
@@ -45,13 +45,13 @@ $$
 . . .
 
 ```python
-entier factorielle(n)
+entier factorielle(entier n)
     i = 1
     fact = 1
     tant que i <= n
         fact *= i
         i += 1
-    retourne i
+    retourne fact
 ```
 
 # Exercice: la factorielle