diff --git a/tests/benchmark/milvus_benchmark/metrics/models/metric.py b/tests/benchmark/milvus_benchmark/metrics/models/metric.py
index 7903e63cce..c051cc1f96 100644
--- a/tests/benchmark/milvus_benchmark/metrics/models/metric.py
+++ b/tests/benchmark/milvus_benchmark/metrics/models/metric.py
@@ -39,6 +39,7 @@ class Metric(object):
 
     # including: metric, suite_metric
     def set_case_metric_type(self):
+        # The current test types on argo are all case
         self._type = "case"
 
     def json_md5(self):