Update README.md

README.md

@@ -16,7 +16,7 @@ install :
 * Then you can make an alias to the main script called "gits" (use gits_for_mac if you are on a mac).
 
 How to use it
-=============
+-------------
 The list of repositories handled by this gitslave repo can be found in the file .gitslave
 All Gitslave command are available hre : http://gitslave.sourceforge.net/gits-man-page.html
 
@@ -27,3 +27,21 @@ if you want to dowload (clone) all slave studio repositories, use the command
 should you want to download a set of slave repositories, use
 
          gits populate <name_of_the_repos1> <name_of_the_repos2>
+
+
+Build The Open Source Studio
+================
+All the following assumes that Maven is installed on you machine.
+First if you have never built any Studio artifacts on your machine you need to build the parent pom.xml
+so please do
+
+```
+cd talend.studio.parent.pom
+mvn clean install
+```
+
+then go back to the root of this repos and launch the same maven command to build all Studio artifacts.
+
+```
+mvn clean install
+```