diff --git a/README.md b/README.md
index e021f2bf7a..6f42e99c50 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-# CodeMirror
+# CodeMirror 5
+
+**NOTE:** [CodeMirror 6](https://codemirror.net/) exists, and is more mobile-friendly, more accessible, better designed, and much more actively maintained.
 
 [![Build Status](https://github.com/codemirror/codemirror5/workflows/main/badge.svg)](https://github.com/codemirror/codemirror5/actions)