comment on save function

SpriteLibrary/SpriteDatabase.cs

@@ -40,7 +40,14 @@ namespace SpriteLibrary
             LoadSpriteInfo();
         }
 
-        internal void Save()
+        /// <summary>
+        /// Tell the database to save the sprite definitions.  Use this while you are creating your game.
+        /// When you are done, you will usually want to take your sprite definition file and add it to the
+        /// resources of your game.  The resources cannot be saved to, so you cannot continue to add new sprites
+        /// once you are loading and saving them from a resources file.  But, the resources file is included with
+        /// the program when you build it.
+        /// </summary>
+        public void Save()
         {
             if(!DoesResourceExist(Filename))
             {