diff --git a/redis-express/README.md b/redis-express/README.md
index 68f2df1..7727ac0 100644
--- a/redis-express/README.md
+++ b/redis-express/README.md
@@ -5,6 +5,8 @@
 
 This API manages books record, built with Express and Redis. It provides routes to add, update, delete, view books, view books by ID, and change task authors.
 
+> **Note:** Keploy records and mocks Redis only in [Keploy Enterprise](https://keploy.io/docs/keploy-cloud/cloud-installation/). The `source keploy.sh` command below installs Keploy Enterprise, and a free account is enough for it (free-tier runs are subject to a usage allowance). The open-source `keploy` (installed with `curl -O https://raw.githubusercontent.com/keploy/keploy/main/keploy.sh && source keploy.sh --oss`, the keploy/keploy GitHub release binary, or the `ghcr.io/keploy/keploy` image) passes the app's Redis calls through to the real Redis server in record and in test mode, records no Redis mocks, and logs that the Redis calls are skipped. With it, keep Redis running while `keploy test` runs; a test whose response depends on Redis data, such as a book that the recording deleted, can then fail, because the app reads and writes the live Redis. The passing test run in this README applies to Keploy Enterprise.
+
 ## Installation
 
 ### Prerequisites