diff --git a/tjnetwork.py b/tjnetwork.py
index 00c9abb..bdfbf8a 100644
--- a/tjnetwork.py
+++ b/tjnetwork.py
@@ -761,5 +761,6 @@ def get_scada_data(name: str, device_id: str) -> dict[str, Any]:
     return api.get_scada_data(name, device_id)
 
 # example: set_scada_data(p, ChangeSet({'device_id': 'sm_device', 'data': [{ 'time': '2023-02-10 00:02:22', 'value': 100.0 }, { 'time': '2023-02-10 00:03:22', 'value': 200.0 }]}))
+# time format must be 'YYYY-MM-DD HH:MM:SS'
 def set_scada_data(name: str, cs: ChangeSet) -> ChangeSet:
     return api.set_scada_data(name, cs)