Add notice in README

Author: hansott

README.md

@@ -100,9 +100,13 @@ See list above for supported database drivers.
 
 ### AI SDKs
 
+Zen instruments the following AI SDKs to track which models are used and how many tokens are consumed, allowing you to monitor your AI usage and costs:
+
 * ✅ [`openai`](https://www.npmjs.com/package/openai) 4.x
 * ✅ [`@aws-sdk/client-bedrock-runtime`](https://www.npmjs.com/package/@aws-sdk/client-bedrock-runtime) 3.x
 
+_Note: Prompt injection attacks are currently not covered by Zen._
+
 ## Installation
 
 We recommend testing Zen locally or on staging before deploying to production.