Add note for Mantle

services/reference/mantle/index.md

@@ -11,6 +11,8 @@ import CardList from '@site/src/components/CardList'
 Mantle is supported through the [DIN](https://www.infura.io/solutions/decentralized-infrastructure-service) service,
 meaning calls to the network are routed to [partner infrastructure providers](#partners-and-privacy-policies).
 
+Infura provides Open Beta access to the Mantle network. During this period, there might be feature limitations. Performance issues are not expected, but they are possible as we optimize and stabilize the service.
+
 :::
 
 Mantle is an Ethereum layer 2 (L2) scaling solution that leverages an optimistic rollup architecture
@@ -55,4 +57,4 @@ Select one of the following options to get started with the Mantle network:
 
 The following partner provides access to Mantle network:
 
-- 0xFury ([Privacy policy](https://0xfury.com/privacy.php))
+- 0xFury ([Privacy policy](https://0xfury.com/privacy.php))