Index: doc/build.md
==================================================================
--- doc/build.md
+++ doc/build.md
@@ -1,16 +1,19 @@
 
 # How to build Grammalecte
 
 ## Required ##
 
+For building:
 * Python 3.7+
-* Firefox Developper
-* Firefox Nightly
 * NodeJS
   * npm
   * web-ext : `https://developer.mozilla.org/fr/Add-ons/WebExtensions/Getting_started_with_web-ext`
+
+For testing:
+* Firefox Developper
+* Firefox Nightly
 * Thunderbird
 
 
 ## Commands ##