diff --git a/docs/ref/forms/api.txt b/docs/ref/forms/api.txt
index 3b0db3a79af..70f455fefee 100644
--- a/docs/ref/forms/api.txt
+++ b/docs/ref/forms/api.txt
@@ -299,6 +299,8 @@ provided in :attr:`~Form.initial`. It returns an empty list if no data differs.
     >>> f = ContactForm(request.POST, initial=data)
     >>> if f.has_changed():
     ...     print("The following fields changed: %s" % ", ".join(f.changed_data))
+    >>> f.changed_data
+    ['subject', 'message']
 
 Accessing the fields from the form
 ==================================