diff --git a/src/Chapter12/Listing12.42.PotentiallyPossibleCovariance.cs b/src/Chapter12/Listing12.42.PossibleCovariance.cs
similarity index 92%
rename from src/Chapter12/Listing12.42.PotentiallyPossibleCovariance.cs
rename to src/Chapter12/Listing12.42.PossibleCovariance.cs
index 200c413b6..fab3df347 100644
--- a/src/Chapter12/Listing12.42.PotentiallyPossibleCovariance.cs
+++ b/src/Chapter12/Listing12.42.PossibleCovariance.cs
@@ -48,8 +48,7 @@ public class Program
 {
     static void Main()
     {
-        // Error: Only theoretically possible without 
-        // the out type parameter modifier
+        // Only possible with out type parameter
         #region HIGHLIGHT
         //Pair<Contact> contacts =
         //    new Pair<Contact>(