diff --git a/types/custom-functions-runtime/index.d.ts b/types/custom-functions-runtime/index.d.ts
index 3b44fb9d21..94c58c6b7b 100644
--- a/types/custom-functions-runtime/index.d.ts
+++ b/types/custom-functions-runtime/index.d.ts
@@ -9,6 +9,11 @@ office-js
 Copyright (c) Microsoft Corporation
 */
 
+
+////////////////////////////////////////////////////////////////
+//////////////////// Begin custom-functions-runtime ////////////
+////////////////////////////////////////////////////////////////
+
 /* 
 * Enables you to map your own name that uses lowercase letters to a function. 
 */
@@ -31,3 +36,8 @@ declare namespace CustomFunctions {
         onCanceled: () => void;
     }
 }
+
+
+////////////////////////////////////////////////////////////////
+//////////////////// BEnd custom-functions-runtime ////////////
+////////////////////////////////////////////////////////////////
\ No newline at end of file