diff --git a/module2/exo1/toy_document_en.Rmd b/module2/exo1/toy_document_en.Rmd
index 08bbc6c8833f5b6cde32b2f8a5b1e17828d9ae57..6a19bca80fb914120a51b313d8081c29fe1fd08d 100644
--- a/module2/exo1/toy_document_en.Rmd
+++ b/module2/exo1/toy_document_en.Rmd
@@ -32,3 +32,7 @@ df$Accept = (df$X**2 + df$Y**2 <=1)
 library(ggplot2)
 ggplot(df, aes(x=X,y=Y,color=Accept)) + geom_point(alpha=.2) + coord_fixed() + theme_bw()
 ```
+
+```{r}
+4*mean(df$Accept)
+```
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