diff --git a/README.md b/README.md
index 7f4f9691025901276b40b8a917b12000da94af7b..46adb1b64f96fed7c30685bb940ee4c8d17a0089 100644
--- a/README.md
+++ b/README.md
@@ -57,10 +57,10 @@ Then create your environement (to do only once)
 
 	# get the course materials 
 	git clone https://gitlab.pasteur.fr/hub-courses/scientific_python.git Scientific_Python_Course
-        cd Scientific_Python_Course
+    cd Scientific_Python_Course
 	
 	# install prerequisites
-        mamba install --file requirements.txt
+    mamba install --file requirements.txt
 
 To exit from the conda environment/mamba