diff --git a/api/client/python/src/openmeter/_operations/_operations.py b/api/client/python/src/openmeter/_operations/_operations.py
index ec9b7fc0b..5ea55045f 100644
--- a/api/client/python/src/openmeter/_operations/_operations.py
+++ b/api/client/python/src/openmeter/_operations/_operations.py
@@ -944,7 +944,8 @@ def query_meter(
         :keyword subject: Default value is None.
         :paramtype subject: list[str]
         :keyword group_by: If not specified a single aggregate will be returned for each subject and
-         time window. Default value is None.
+         time window.
+         ``subject`` is a reserved group by value. Default value is None.
         :paramtype group_by: list[str]
         :return: JSON object or str
         :rtype: JSON or str
diff --git a/api/client/python/src/openmeter/aio/_operations/_operations.py b/api/client/python/src/openmeter/aio/_operations/_operations.py
index b5000a989..d8a980b0f 100644
--- a/api/client/python/src/openmeter/aio/_operations/_operations.py
+++ b/api/client/python/src/openmeter/aio/_operations/_operations.py
@@ -740,7 +740,8 @@ async def query_meter(
         :keyword subject: Default value is None.
         :paramtype subject: list[str]
         :keyword group_by: If not specified a single aggregate will be returned for each subject and
-         time window. Default value is None.
+         time window.
+         ``subject`` is a reserved group by value. Default value is None.
         :paramtype group_by: list[str]
         :return: JSON object or str
         :rtype: JSON or str