diff --git a/module2/exo3/exercice_python_fr.org b/module2/exo3/exercice_python_fr.org
index 1200777acea9dc178223083d4ded0750d2c739bb..4238dab81f455371e503d583aff874ed193dec2b 100644
--- a/module2/exo3/exercice_python_fr.org
+++ b/module2/exo3/exercice_python_fr.org
@@ -32,6 +32,7 @@ x=np.array(data)
 #+begin_src python :results output file :session :var matplot_lib_filename="./figure1.png" :exports both
 plt.clf()
 plt.plot(x)
+plt.grid(True)
 plt.savefig(matplot_lib_filename)
 print(matplot_lib_filename)
 #+end_src
@@ -42,6 +43,7 @@ print(matplot_lib_filename)
 #+begin_src python :results output file :session :var matplot_lib_filename="./figure2.png" :exports both
 plt.clf()
 plt.hist(x)
+plt.grid(True)
 plt.savefig(matplot_lib_filename)
 print(matplot_lib_filename)
 #+end_src