diff --git a/tests/python_client/common/milvus_sys.py b/tests/python_client/common/milvus_sys.py
index 231e95cca8..082c59c006 100644
--- a/tests/python_client/common/milvus_sys.py
+++ b/tests/python_client/common/milvus_sys.py
@@ -70,4 +70,5 @@ class MilvusSys:
 
     @property
     def nodes(self):
+        """get all the nodes in Milvus deployment"""
         return json.loads(self.sys_info.response).get('nodes_info')