Updated per feedback

Author: ecfan

Diff for: articles/logic-apps/workflow-definition-language-functions-reference.md

@@ -6,7 +6,7 @@ ms.suite: integration
 ms.reviewer: estfan, niding, azla
 ms.topic: reference
 ms.custom: engagement-fy23
-ms.date: 09/20/2022
+ms.date: 04/07/2023
 ---
 
 # Reference guide to workflow expression functions in Azure Logic Apps and Power Automate
@@ -20,6 +20,10 @@ For workflow definitions in [Azure Logic Apps](../logic-apps/logic-apps-overview
 > Azure Logic Apps documentation. Although this page refers specifically to logic app workflows, 
 > these functions work for both flows and logic app workflows. For more information about functions 
 > and expressions in Power Automate, review [Use expressions in conditions](/power-automate/use-expressions-in-conditions).
+> 
+> In Consumption and Standard logic apps, all function expressions use the [.NET XPath library](/dotnet/api/system.xml.xpath). 
+> XPath expressions are compatible with the underlying .NET library and support only the expression 
+> that the underlying .NET library supports.
 
 For example, you can calculate values by using math functions, such as the [add()](../logic-apps/workflow-definition-language-functions-reference.md#add) function, when you want the sum from integers or floats. Here are other example tasks that you can perform with functions: