diff --git a/docs/ref/models/fields.txt b/docs/ref/models/fields.txt
index dd0d025ab27..1e3476166f2 100644
--- a/docs/ref/models/fields.txt
+++ b/docs/ref/models/fields.txt
@@ -300,7 +300,9 @@ For example, if you have a field ``title`` that has
 records with the same ``title`` and ``pub_date``.
 
 Note that if you set this to point to a :class:`DateTimeField`, only the date
-portion of the field will be considered.
+portion of the field will be considered. Besides, when :setting:`USE_TZ` is
+``True``, the check will be performed in the :ref:`current time zone
+<default-current-time-zone>` at the time the object gets saved.
 
 This is enforced by :meth:`Model.validate_unique()` during model validation
 but not at the database level. If any :attr:`~Field.unique_for_date` constraint