diff --git a/module2/exo4/RRtest.csv b/module2/exo4/RRtest.csv
index fe3807ae74ebd2732393758c3928cf1a4b062c85..9d785e81ad00e621e2b54a6cea1e8ba88a411438 100644
--- a/module2/exo4/RRtest.csv
+++ b/module2/exo4/RRtest.csv
@@ -1,3 +1,4 @@
+x,square,cube
 1,1,1
 2,4,8
 3,9,27