add missing doc string

Author: bckohan

django_enum/filters.py

@@ -43,6 +43,7 @@ class FilterSet(filterset.FilterSet):
         """
         @classmethod
         def filter_for_lookup(cls, field, lookup_type):
+            """For EnumFields use the EnumFilter class by default"""
             if isinstance(field, EnumMixin) and getattr(field, 'enum', None):
                 return EnumFilter, {'enum': field.enum}
             return super().filter_for_lookup(field, lookup_type)

doc/source/refs.rst

@@ -3,6 +3,7 @@
 .. _GitHub: https://github.com/bckohan/enum-properties
 .. _PyPI: https://pypi.python.org/pypi/enum-properties
 .. _Enum: https://docs.python.org/3/library/enum.html#enum.Enum
+.. _enumerations: https://docs.python.org/3/library/enum.html#enum.Enum
 .. _ValueError: https://docs.python.org/3/library/exceptions.html#ValueError
 .. _get_db_prep_value: https://docs.djangoproject.com/en/stable/ref/models/fields/#django.db.models.Field.get_db_prep_value
 .. _from_db_value: https://docs.djangoproject.com/en/stable/ref/models/fields/#django.db.models.Field.from_db_value