diff --git a/src/Features/CSharp/Portable/SimplifyTypeNames/SimplifyTypeNamesCodeFixProvider.cs b/src/Features/CSharp/Portable/SimplifyTypeNames/SimplifyTypeNamesCodeFixProvider.cs
index af5475ef1eabab87aecea6ac57949f3307a3ed70..89b18dec0803faa0e98490c382bf915ee4b2b60d 100644
--- a/src/Features/CSharp/Portable/SimplifyTypeNames/SimplifyTypeNamesCodeFixProvider.cs
+++ b/src/Features/CSharp/Portable/SimplifyTypeNames/SimplifyTypeNamesCodeFixProvider.cs
@@ -43,6 +43,10 @@ protected override string GetTitle(string diagnosticId, string nodeText)
 
         protected override SyntaxNode AddSimplificationAnnotationTo(SyntaxNode expressionSyntax)
         {
+            // Add the DoNotAllowVarAnnotation annotation.  All the code fixer
+            // does is pass the tagged node to the simplifier.  And we do *not*
+            // ever want the simplifier to produce 'var' in the 'Simplify type
+            // names' fixer.  only the 'Use var' fixer should produce 'var'.
             var annotatedexpressionSyntax = expressionSyntax.WithAdditionalAnnotations(
                 Simplifier.Annotation, Formatter.Annotation, DoNotAllowVarAnnotation.Annotation);