diff --git a/README.md b/README.md
index 8ba0ebf84f3..32d60c2826d 100644
--- a/README.md
+++ b/README.md
@@ -282,6 +282,8 @@ Stripe has features in the [private preview phase](https://docs.stripe.com/relea
 
 ### Custom requests
 
+> This feature is only available from version 27 of this SDK.
+
 If you would like to send a request to an undocumented API (for example you are in a private beta), or if you prefer to bypass the method definitions in the library and specify your request details directly, you can use the `rawRequest` method on `StripeClient`.
 
 ```java