diff --git a/slides/cours_2.md b/slides/cours_2.md
index 5f8b46f4266dcb9d8b7aef997369244a213592a5..e3fedbff96822d5446149d11753c305eaf1196ec 100644
--- a/slides/cours_2.md
+++ b/slides/cours_2.md
@@ -247,6 +247,7 @@ int main() {
 }
 ```
 
+# Le PGCD
 
 ```C
 #include <stdio.h>