diff --git a/docs/ref/forms/api.txt b/docs/ref/forms/api.txt
index 6919f600b1..8bf8f3c9c1 100644
--- a/docs/ref/forms/api.txt
+++ b/docs/ref/forms/api.txt
@@ -470,10 +470,10 @@ Notice the following:
* Each field type has a default HTML representation. ``CharField`` is
represented by an ```` and ``EmailField`` by an
- ````.
- ``BooleanField`` is represented by an ````. Note
- these are merely sensible defaults; you can specify which HTML to use for
- a given field by using widgets, which we'll explain shortly.
+ ````. ``BooleanField(null=False)`` is represented by an
+ ````. Note these are merely sensible defaults; you can
+ specify which HTML to use for a given field by using widgets, which we'll
+ explain shortly.
* The HTML ``name`` for each tag is taken directly from its attribute name
in the ``ContactForm`` class.