WSDL definition of class

[GlenW]

I'm having a mental block, I can't remember how to make a class in my web service available to clients.
None of the methods in the service return or accept this class but one of them may return them in an array list. How do I make the sevice include a definition for this class in the wsdl file?

[mendhak]

If you want to return an object of that class' type, make the class serializable.

[GlenW]

If you want to return an object of that class' type, make the class serializable.

I'm not directly returning an object of that type. I return an array list that may contain one or more of them.
There is a way to instruct the web service to declare the class in the wsdl file but I can't remember how or find in on msdn.