diff --git a/nebius/iam/v1/federated_credentials_service.proto b/nebius/iam/v1/federated_credentials_service.proto
index 87bbcf6..6ae5b9a 100644
--- a/nebius/iam/v1/federated_credentials_service.proto
+++ b/nebius/iam/v1/federated_credentials_service.proto
@@ -13,6 +13,9 @@ option java_multiple_files = true;
 option java_outer_classname = "FederatedCredentialsServiceProto";
 option java_package = "ai.nebius.pub.iam.v1";
 
+// [PUBLIC PREVIEW]
+// This feature is currently available only for early adopters.
+// Contact the support team to check whether your tenant is eligible for it.
 service FederatedCredentialsService {
   option (api_service_name) = "cpl.iam";