diff --git a/README.md b/README.md
index 3081cc045533e031045332c39568d5a1f6ef1e82..18909330f7d8fd060a3a7dc00cd26a67193c635e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+
+
+*NOTE: This README reflects the in development version of Mirador 3. For previous versions, please reference that release's README directly. Latest 2.x release: [v.2.7.0](https://github.com/ProjectMirador/mirador/tree/v2.7.0)*
+
 ## Running Mirador locally
 
 1. Run `npm install` to install the dependencies.