diff --git a/Large-app-how-to.md b/Large-app-how-to.md
index 13e4de8..a78ad1e 100644
--- a/Large-app-how-to.md
+++ b/Large-app-how-to.md
@@ -206,7 +206,7 @@ Now that we've done our object model, time to build the form that goes with it.
           DataRequired(),
           EqualTo('password', message='Passwords must match')
           ])
-      accept_tos = BooleanField('I accept the TOS', [Required()])
+      accept_tos = BooleanField('I accept the TOS', [DataRequired()])
       recaptcha = RecaptchaField()
 ```