diff --git a/spec/descriptions/updateApplicationAlertConfig.md b/spec/descriptions/updateApplicationAlertConfig.md
index 65893df..a61945c 100644
--- a/spec/descriptions/updateApplicationAlertConfig.md
+++ b/spec/descriptions/updateApplicationAlertConfig.md
@@ -1 +1,9 @@
 This API endpoint updates the Application Alert Configuration.
+
+### Parameters:
+
+**tagFilterExpression**
+
+Note: Any changes in this field might have side effects on issue detection on all selected entities. For static thresholds this
+should not be critical as the effect might last up to period of time equal to the granularity. Whereas for Adaptive Baseline it
+might take a significant amount of time to rebuild the Adaptive Baseline model and start detecting issues again.
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