Update how-to-use-custom-functions.md

Author: KendalBond007

articles/healthcare-apis/iot/how-to-use-custom-functions.md

@@ -9,9 +9,10 @@ ms.date: 08/01/2023
 ms.author: chrupa
 ---
 
+# How to use custom functions with the MedTech service device mapping
+
 > [!IMPORTANT]
 > As of 2/26/2025 the MedTech service will no longer be available in the following regions: UK West, UAE North, South Africa North, Qatar Central.
-# How to use custom functions with the MedTech service device mapping
 
 Many functions are available when using **JMESPath** as the expression language. Besides the built-in functions available as part of the [JMESPath specification](https://jmespath.org/specification.html#built-in-functions), many more custom functions can also be used. This article describes how to use the MedTech service-specific custom functions with the MedTech service [device mapping](overview-of-device-mapping.md).