How to specify Namespace for a type created through Reflection.Emit?

Apologies if I'm missing something obvious, but when I create a new type with Reflection.Emit, how do I specify what namespace it should be in?

ie..

AssemblyName assemblyName = new AssemblyName();
assemblyName.Name = "TestDynamic";

AssemblyBuilder assemblyBuilder = 
    AppDomain.CurrentDomain.DefineDynamicAssembly(
        assemblyName,   
        AssemblyBuilderAccess.Save);

ModuleBuilder moduleBuilder =    
    AssemblyBuilder.DefineDynamicModule("TestDynamic", "TestDynamic.dll");

TypeBuilder myTestInterface =
    moduleBuilder.DefineType("MyTestInterface", 
    TypeAttributes.Public | TypeAttributes.Interface, typeof(object));

How do I give a namespace for myTestInterface?