diff --git a/src/Chapter12/Listing12.16.UsingArityToOverloadATypeDefinition.cs b/src/Chapter12/Listing12.16.UsingArityToOverloadATypeDefinition.cs
index 7dfde3809..e529d0550 100644
--- a/src/Chapter12/Listing12.16.UsingArityToOverloadATypeDefinition.cs
+++ b/src/Chapter12/Listing12.16.UsingArityToOverloadATypeDefinition.cs
@@ -26,7 +26,8 @@ public class Tuple<T1, T2, T3, T4> // : IStructuralEquatable,
     // ...
 }
 public class Tuple<T1, T2, T3, T4, T5> // : IStructuralEquatable,
-                                       // IStructuralComparable, IComparable
+                                       // IStructuralComparable,
+                                       // IComparable
 {
     // ...
 }