[tools] Add an obsolescence warning to trunk branch
diff --git a/README.md b/README.md
index 32fe6ce..cc3d818 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 Title: Apache Velocity Tools
 
+Note : the trunk branch is obsolete. Please use the master branch.
+
 # Apache Velocity Tools
 
 Welcome to the VelocityTools projects. This is a subproject of the