diff --git a/tests/benchmark/milvus_benchmark/runners/search.py b/tests/benchmark/milvus_benchmark/runners/search.py
index 6c6417424e..6cfcf3650f 100644
--- a/tests/benchmark/milvus_benchmark/runners/search.py
+++ b/tests/benchmark/milvus_benchmark/runners/search.py
@@ -188,6 +188,7 @@ class InsertSearchRunner(BaseRunner):
                             "params": search_param}
                         # TODO: only update search_info
                         case_metric = copy.deepcopy(self.metric)
+                        # set metric type as case
                         case_metric.set_case_metric_type()
                         case_metric.search = {
                             "nq": nq,