update readme

README.md

@@ -4,10 +4,20 @@
 [![license](https://img.shields.io/github/license/vdelachaux/4DPop-Git)](LICENSE)
 [![release](https://img.shields.io/github/v/release/vdelachaux/4DPop-Git?include_prereleases)](https://github.com/vdelachaux/4DPop-Git/releases/latest)
 
-# 4DPop Git (18R3+)
+# 4DPop Git
 
 No need to read the <a href="https://git-scm.com/docs/git">**git**</a> command documentation or to be an expert of the Terminal, everything is done automatically for you, just stay focused on your work.
 
+## Note
+
+The master branch is under development with the main branch of 4D. Thus, some commands or features may not be available in the latest public release and you will not be able to compile or it could generate runtime errors.
+
+**You should always use the branch whose name is the version of your 4D application. ie 18R3 branch with 4D 18R3 for example..**
+
+[Choose the version](https://github.com/vdelachaux/4DPop-Git/branches)
+
+---------- 
+
 <img src="./Documentation/main.png">
 
 <img src="./Documentation/commits.png">