Added missing comments.

Author: Sergey-Vlasov

Source/ExcelDna.Integration/Registration/ExcelRegistration.cs

@@ -8,6 +8,13 @@
 
 namespace ExcelDna.Registration
 {
+    // Ideas:
+    // * Object Instances - Methods and Properties (with INotifyPropertyChanged support, and Disposable from Observable handles)
+    // * Struct semantics, like built-in COMPLEX data
+    // * Cache  - PostSharp example from: http://vimeo.com/66549243 (esp. MethodExecutionTag for keeping stuff together)
+    // * Apply a Module name XlQualifiedName(true), or use Class Name.
+
+    // A first attempt to allow chaining of the Registration rewrites.
     public static class ExcelRegistration
     {
         /// <summary>

Source/ExcelDna.Integration/Registration/ParameterConversionConfiguration.cs

@@ -5,6 +5,12 @@
 
 namespace ExcelDna.Registration
 {
+    // Used for parameter and return type conversions (when these can be done without interfering with the rest of the function).
+
+    // CONSIDER: Add a name to the XXXConversion for tracing and debugging
+    // CONSIDER: Do we need to consider Co-/Contravariance and allow processing of sub-/super-types?
+    // What about native async function, they return 'void' type?
+
     public class ParameterConversionConfiguration
     {
         internal class ParameterConversion