diff --git a/envoy/api/v2/endpoint/load_report.proto b/envoy/api/v2/endpoint/load_report.proto
index 58580d42..e862074b 100644
--- a/envoy/api/v2/endpoint/load_report.proto
+++ b/envoy/api/v2/endpoint/load_report.proto
@@ -117,10 +117,16 @@ message EndpointLoadMetricStats {
 // Per cluster load stats. Envoy reports these stats a management server in a
 // :ref:`LoadStatsRequest<envoy_api_msg_load_stats.LoadStatsRequest>`
 // [#not-implemented-hide:] Not configuration. TBD how to doc proto APIs.
+// Next ID: 7
 message ClusterStats {
   // The name of the cluster.
   string cluster_name = 1 [(validate.rules).string.min_bytes = 1];
 
+  // The eds_cluster_config service_name of the cluster.
+  // It's possible that two clusters send the same service_name to EDS,
+  // in that case, the management server is supposed to do aggregation on the load reports.
+  string cluster_service_name = 6;
+
   // Need at least one.
   repeated UpstreamLocalityStats upstream_locality_stats = 2
       [(validate.rules).repeated .min_items = 1];