diff --git a/module2/exo1/toy_document_en.Rmd b/module2/exo1/toy_document_en.Rmd
index 2b88692ec2835dd5bb9d30435533ef89497f4b62..2717d02d3a5b765d48048b4126c988bc2adac359 100644
--- a/module2/exo1/toy_document_en.Rmd
+++ b/module2/exo1/toy_document_en.Rmd
@@ -5,8 +5,8 @@ date: "25 juin 2018"
 output: html_document
 ---
 
-```{r setup, include=FALSE}	
-knitr::opts_chunk$set(echo = TRUE)	
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(echo = TRUE)
 ```
 
 ## Asking the maths library
@@ -38,7 +38,7 @@ library(ggplot2)
 ggplot(df, aes(x=X,y=Y,color=Accept)) + geom_point(alpha=.2) + coord_fixed() + theme_bw()
 ```
 
-It is then straightforward to obtain a (not really good) approximation to $\pi$ by counting how many times, on average, $X^2 + Y^2$ is smaller than 1 :
+It is then straightforward to obtain a (not really good) approximation to $\pi$ by counting how many times, on average, $X^2 + Y^2$ is smaller than 1:
 
 ```{r}
 4*mean(df$Accept)