Documenting WCF RESTful service through the Service help page

Question

I'm using the RESTful service starter kit and was having trouble adding documentation to the built in Service help page. I'm able to add documentation to each method in the Description using the WebHelp attribute.

What I need and want to add documentation to the Request Schema that is generated for each method through the Request Schema link. In other words I want to add documentation to each DataMember in the DataContract and have it included in the generated Request Schema.