diff --git a/specification/_global/reindex/ReindexRequest.ts b/specification/_global/reindex/ReindexRequest.ts
index 902c8ea528..594589e5a0 100644
--- a/specification/_global/reindex/ReindexRequest.ts
+++ b/specification/_global/reindex/ReindexRequest.ts
@@ -45,7 +45,8 @@ import { Destination, Source } from './types'
  * * To automatically create a data stream or index with a reindex API request, you must have the `auto_configure`, `create_index`, or `manage` index privilege for the destination data stream, index, or alias.
  * * If reindexing from a remote cluster, the `source.remote.user` must have the `monitor` cluster privilege and the `read` index privilege for the source data stream, index, or alias.
  *
- * If reindexing from a remote cluster, you must explicitly allow the remote host in the `reindex.remote.whitelist` setting.
+ * If reindexing from a remote cluster into a cluster using Elastic Stack, you must explicitly allow the remote host using the `reindex.remote.whitelist` node setting on the destination cluster.
+ * If reindexing from a remote cluster into an Elastic Cloud Serverless project, only remote hosts from Elastic Cloud Hosted or Elastic Cloud Serverless are allowed.
  * Automatic data stream creation requires a matching index template with data stream enabled.
  *
  * The `dest` element can be configured like the index API to control optimistic concurrency control.