diff --git a/README.md b/README.md
index 3881cea..d0b78bc 100644
--- a/README.md
+++ b/README.md
@@ -122,7 +122,7 @@ Here's an example of a tag that will make all of its content upper case:
     public class UpperTagDefinition : ContentTagDefinition
     {
         public UpperTagDefinition()
-            : base(true)
+            : base("upper")
         {
         }