some comments explaining method organization

PortableGL/GL20.cs

@@ -2,6 +2,8 @@ using System;
 
 namespace PortableGL
 {
+	// This should only include declarations for standard OpenGL ES 2.0 functions and constant values.
+
 	public abstract partial class GL20
 	{
 		#region Constants

PortableGL/GL20ConvenienceHelpers.cs

@@ -3,6 +3,13 @@ using System.Text;
 
 namespace PortableGL
 {
+	// This is where "convenience" overloads for commonly used OpenGL functions
+	// can go. The intention here is to provide ways to reduce some repetitive
+	// code on the caller-side. These overloads will not exactly match the
+	// OpenGL ES 2.0 spec obviously.
+	//
+	// Overloads here should really be kept to a bare minimum!
+
 	public abstract partial class GL20
 	{
 		public void glDeleteBuffers(int buffer)

PortableGL/GL20Helpers.cs

@@ -3,6 +3,12 @@ using System.Text;
 
 namespace PortableGL
 {
+	// This should only contain method overloads for standard OpenGL functions
+	// which take pointer(s) as arguments. These overloads should simply provide
+	// the caller with "simpler" alternatives to use if they wish to avoid using
+	// unsafe code themselves directly. This should really only be stuff like
+	// using "out" parameters and arrays instead of equivalent pointer arguments.
+
 	public abstract partial class GL20
 	{
 		public unsafe void glBufferData<T>(int target, int size, T[] data, int usage) where T : struct