Comment code.

src/Workspaces/Core/Portable/LanguageServices/SyntaxFactsService/AbstractSyntaxFactsService.cs

@@ -11,6 +11,12 @@ internal abstract class AbstractSyntaxFactsService
     {
         private readonly static ObjectPool<List<Dictionary<string, string>>> s_aliasMapListPool =
             new ObjectPool<List<Dictionary<string, string>>>(() => new List<Dictionary<string, string>>());
+
+        // Note: these names are stored case insensitively.  That way the alias mapping works 
+        // properly for VB.  It will mean that our inheritance maps may store more links in them
+        // for C#.  However, that's ok.  It will be rare in practice, and all it means is that
+        // we'll end up examining slightly more types (likely 0) when doing operations like 
+        // Find all references.
         private readonly static ObjectPool<Dictionary<string, string>> s_aliasMapPool =
             new ObjectPool<Dictionary<string, string>>(() => new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase));