diff --git a/types/custom-functions-runtime/custom-functions-runtime-tests.ts b/types/custom-functions-runtime/custom-functions-runtime-tests.ts
index 9d01cc64e6..335e5a1f95 100644
--- a/types/custom-functions-runtime/custom-functions-runtime-tests.ts
+++ b/types/custom-functions-runtime/custom-functions-runtime-tests.ts
@@ -1,3 +1,4 @@
+/* Note that this is a sample function for the purpose of running the below CustomFunctionsMappings test */
 function ADD10(n: number) {
     return n + 10;
 }