diff --git a/README.md b/README.md
index a15917a4..7bf2bea3 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@ Vector/Web
 
 Vector is a Matrix web client built using the Matrix React SDK (https://github.com/matrix-org/matrix-react-sdk).
 
+## Currently the master branch of Vector is very stale.  Please use the develop branch.
+
 Getting started
 ===============