diff --git a/module2/exo1/toy_document_orgmode_python_en.org b/module2/exo1/toy_document_orgmode_python_en.org
index 9dc0f60f6aa936a8f8cea3222407c1f8d9fed5b0..77c3e86ec6d906900d7af6b81cf428bad54aeb87 100644
--- a/module2/exo1/toy_document_orgmode_python_en.org
+++ b/module2/exo1/toy_document_orgmode_python_en.org
@@ -1,4 +1,4 @@
-#+TITLE:  On the computation of pi
+#+TITLE: On the computation of pi
 #+LANGUAGE: en
 
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="http://www.pirilampo.org/styles/readtheorg/css/htmlize.css"/>
@@ -32,9 +32,9 @@ theta = np.random.uniform(size=N, low=0, high=pi/2)
 
 * Using a surface fraction argument
 A method that is easier to understand and does not make use of the
-$\sin$ function is based on the fact that if $X\sim U(0,1)$ and $Y\sim
+$\sin$ function is based on the fact that if $X\sim U(0,1)$ and $Y\sim 
 U(0,1)$, then $P[X^2+Y^2\leq 1] = \pi/4$ (see [[https://en.wikipedia.org/wiki/Monte_Carlo_method]["Monte Carlo method" on
-Wikipedia]]). The following code uses this approach: 
+Wikipedia]]). The following code uses this approach:
 
 #+begin_src python :results output file :var matplot_lib_filename="figure_pi_mc2.png" :exports both :session *python* 
 import matplotlib.pyplot as plt