diff --git a/scouter/workflow/pi_web_api_scouter.py b/scouter/workflow/pi_web_api_scouter.py
index acaa1dc..d9d6d96 100644
--- a/scouter/workflow/pi_web_api_scouter.py
+++ b/scouter/workflow/pi_web_api_scouter.py
@@ -59,7 +59,7 @@ class PIWebAPIScouter:
                   to WebIds and processing rules, including:
                     - webid (str): PI Web API WebId for the tag
                     - data_range: [min, max] values for data validation
-                    - aggr_function: Aggregation method (avg, mdn, max, min, lts)
+                    - aggr_func: Aggregation method (avg, mdn, max, min, lts)
                     - frequency: Data collection frequency in milliseconds
                     - topics: List of Kafka topics for data routing