diff --git a/django/conf/locale/en/LC_MESSAGES/django.po b/django/conf/locale/en/LC_MESSAGES/django.po
index 57a56eabcd..cc5dbee4ab 100644
--- a/django/conf/locale/en/LC_MESSAGES/django.po
+++ b/django/conf/locale/en/LC_MESSAGES/django.po
@@ -4,7 +4,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Django\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2014-05-19 15:17+0200\n"
+"POT-Creation-Date: 2014-07-26 13:48+0200\n"
 "PO-Revision-Date: 2010-05-13 15:35+0200\n"
 "Last-Translator: Django team\n"
 "Language-Team: English <en@li.org>\n"
@@ -454,7 +454,9 @@ msgstr ""
 msgid "%(model_name)s with this %(field_label)s already exists."
 msgstr ""
 
-#: db/models/fields/__init__.py:109
+#. Translators: The 'lookup_type' is one of 'date', 'year' or 'month'.
+#. Eg: "Title must be unique for pub_date year"
+#: db/models/fields/__init__.py:111
 #, python-format
 msgid ""
 "%(field_label)s must be unique for %(date_field_label)s %(lookup_type)s."
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 7d4f8e152e..56c25f0045 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -106,6 +106,8 @@ class Field(RegisterLookupMixin):
         'blank': _('This field cannot be blank.'),
         'unique': _('%(model_name)s with this %(field_label)s '
                     'already exists.'),
+        # Translators: The 'lookup_type' is one of 'date', 'year' or 'month'.
+        # Eg: "Title must be unique for pub_date year"
         'unique_for_date': _("%(field_label)s must be unique for "
                              "%(date_field_label)s %(lookup_type)s."),
     }