diff --git a/module2/exo3/exercice_fr.Rmd b/module2/exo3/exercice_fr.Rmd
index 93dbe874a437d8d7c336024ba01fe0b6a8f218d4..41b50297363e674972330489113defb0fdd1ba81 100644
--- a/module2/exo3/exercice_fr.Rmd
+++ b/module2/exo3/exercice_fr.Rmd
@@ -19,10 +19,12 @@ data <- c(14.0, 7.6, 11.2, 12.8, 12.5, 9.9, 14.9, 9.4, 16.9, 10.2, 14.9, 18.1, 7
 ## Courbe
 
 ```{r}
-plot(data, type = "l", col = "blue", ylim = c(0,25), xlab="", ylab="")
+plot(data, type = "l", col = "blue", panel.first = grid(), ylim = c(0,25), xlab="", ylab="")
+# panel.first = grid() permet d'ajouter un grillage en fond 
 ```
 
 ## Histogramme
 ```{r}
-hist(data, col = "blue", ylim = c(0,25), xlim = c(0,25), xlab="", ylab="", main="")
+hist(data, col = "blue", panel.first = grid(), ylim = c(0,25), xlim = c(0,25), xlab="", ylab="", main="")
+# + box(col="black") # encadre le graphique mais une erreur apparait
 ```
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