diff --git a/lib/core/client.js b/lib/core/client.js
index 53f27fe5fbf5..35c555488761 100644
--- a/lib/core/client.js
+++ b/lib/core/client.js
@@ -1 +1,3 @@
+// @storybook/core was split into core-client and core-server.  This file is for backwards-compat.
+// TODO: remove in 7.0
 module.exports = require('./dist/esm/index');