diff --git a/django/db/backends/postgresql_psycopg2/creation.py b/django/db/backends/postgresql_psycopg2/creation.py
index 90304aa..88afd5f 100644
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class DatabaseCreation(BaseDatabaseCreation):
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42 | 42 | |
43 | 43 | def sql_indexes_for_field(self, model, f, style): |
44 | 44 | output = [] |
45 | | if f.db_index: |
| 45 | if f.db_index or f.unique: |
46 | 46 | qn = self.connection.ops.quote_name |
47 | 47 | db_table = model._meta.db_table |
48 | 48 | tablespace = f.db_tablespace or model._meta.db_tablespace |
diff --git a/docs/ref/models/fields.txt b/docs/ref/models/fields.txt
index a2081e0..c6a23db 100644
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field, a :exc:`django.db.IntegrityError` will be raised by the model's
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272 | 272 | This option is valid on all field types except :class:`ManyToManyField` and |
273 | 273 | :class:`FileField`. |
274 | 274 | |
| 275 | Note that when ``unique`` is ``True``, you don't need to specify |
| 276 | :attr:`~Field.db_index`, because ``unique`` implies the creation of an index. |
| 277 | |
275 | 278 | ``unique_for_date`` |
276 | 279 | ------------------- |
277 | 280 | |
diff --git a/tests/regressiontests/indexes/models.py b/tests/regressiontests/indexes/models.py
index 4ab74d2..e38eb00 100644
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if connection.vendor == 'postgresql':
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17 | 17 | class IndexedArticle(models.Model): |
18 | 18 | headline = models.CharField(max_length=100, db_index=True) |
19 | 19 | body = models.TextField(db_index=True) |
20 | | slug = models.CharField(max_length=40, unique=True, db_index=True) |
| 20 | slug = models.CharField(max_length=40, unique=True) |