diff --git a/demos/function/README.md b/demos/function/README.md
index d4138ec..bee3fa5 100644
--- a/demos/function/README.md
+++ b/demos/function/README.md
@@ -114,6 +114,11 @@ The `LambdaProxy` example reads files from form data and converts to CSV.
 When deploying on AWS, be sure to `npm install` locally and include the modules
 in the ZIP file.
 
+When reading form data, be sure to include the necessary binary types on the AWS API Gateway console.
+To do this, navigate to the "Binary Media Types" section in the settings tab of the console.
+For reading a file, you may need to add "multipart/form-data".
+For downloading a file, you may need to add "application/vnd.ms-excel".
+
 #### Azure Functions
 
 Azure supports many types of triggers.  The `AzureHTTPTrigger` shows an example