diff --git a/slides/cours_5.md b/slides/cours_5.md
index 93e7c6933ae63ba4c01bf3a434eb33f54cb080ba..46fe25ce6ae31482b4f5496a9bd5560ee897b714 100644
--- a/slides/cours_5.md
+++ b/slides/cours_5.md
@@ -249,6 +249,8 @@ $$
     
     ```C
     num = 247
+    N = 0
+
     tant que (2^(N+1) < num) {
         N += 1
     }