diff --git a/api/etcdserverpb/rpc.proto b/api/etcdserverpb/rpc.proto
index a9dc1889a..9cdc0b37f 100644
--- a/api/etcdserverpb/rpc.proto
+++ b/api/etcdserverpb/rpc.proto
@@ -695,6 +695,8 @@ message HashKVResponse {
   uint32 hash = 2;
   // compact_revision is the compacted revision of key-value store when hash begins.
   int64 compact_revision = 3;
+  // hash_revision is the revision up to which the hash is calculated.
+  int64 hash_revision = 4 [(versionpb.etcd_version_field)="3.6"];
 }
 
 message HashResponse {