diff --git a/ex4/ex4.c b/ex4/ex4.c
index 1d1275987fff5b445760768402d19f523da922b8..0e7256cdff0188eae38d4a35dc128b8c462a7cd5 100644
--- a/ex4/ex4.c
+++ b/ex4/ex4.c
@@ -201,6 +201,12 @@ Matrix *quadtree_to_matrix(Node *root) {
 
 // ---
 
+/**
+ * @brief Clone a Quadtree.
+ * 
+ * @param root 
+ * @return Node* 
+ */
 Node *clone(Node *root) {
     if (root == NULL) {
         return NULL;