diff --git a/tests/benchmark/milvus_benchmark/runners/accuracy.py b/tests/benchmark/milvus_benchmark/runners/accuracy.py
index c2be5d2b9e..72e1ab9bb4 100644
--- a/tests/benchmark/milvus_benchmark/runners/accuracy.py
+++ b/tests/benchmark/milvus_benchmark/runners/accuracy.py
@@ -62,6 +62,7 @@ class AccuracyRunner(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,