diff --git a/docs/model-api.txt b/docs/model-api.txt
index a0844ea961..b49963d8f5 100644
--- a/docs/model-api.txt
+++ b/docs/model-api.txt
@@ -149,7 +149,7 @@ and in Django's validation.
 Django veterans: Note that the argument is now called ``max_length`` to
 provide consistency throughout Django. There is full legacy support for
 the old ``maxlength`` argument, but ``max_length`` is preferred.
-	
+
 ``CommaSeparatedIntegerField``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -678,7 +678,9 @@ set.
 
 If ``True``, this field must be unique throughout the table.
 
-This is enforced at the database level and at the Django admin-form level.
+This is enforced at the database level and at the Django admin-form level. If
+you try to add save a model with a duplicate value in a ``unique`` field, a
+``django.db.IntegrityError`` will be raised by the model's ``save()`` method.
 
 ``unique_for_date``
 ~~~~~~~~~~~~~~~~~~~
@@ -1584,8 +1586,8 @@ Finally, note that in order to use ``list_display_links``, you must define
 
 Set ``list_filter`` to activate filters in the right sidebar of the change list
 page of the admin. This should be a list of field names, and each specified
-field should be either a ``BooleanField``, ``CharField``, ``DateField``, 
-``DateTimeField``, ``IntegerField`` or ``ForeignKey``. 
+field should be either a ``BooleanField``, ``CharField``, ``DateField``,
+``DateTimeField``, ``IntegerField`` or ``ForeignKey``.
 
 This example, taken from the ``django.contrib.auth.models.User`` model, shows
 how both ``list_display`` and ``list_filter`` work::