diff --git a/source/installation/installation.rst b/source/installation/installation.rst
index be57b7cb2..dcc4a0924 100644
--- a/source/installation/installation.rst
+++ b/source/installation/installation.rst
@@ -201,10 +201,13 @@ Those will populate database, respectively, with countries (using ISO declaratio
 Building CSS (optionnal)
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
+For this step, npm must be installed.
+
 A build version of the needed CSS file is provided within the main bundle `Resources/public/css/chillmain.css`. For rebuilding it :
 
 
 .. code-block:: bash
+
    #in the main bundle directory ( vendor/chill-project/main/ )
    cd Resources/
    npm install