Add link to drf-extra-fields. Closes #1698

docs/api-guide/fields.md

@@ -357,9 +357,16 @@ The following third party packages are also available.
 
 The [drf-compound-fields][drf-compound-fields] package provides "compound" serializer fields, such as lists of simple values, which can be described by other fields rather than serializers with the `many=True` option. Also provided are fields for typed dictionaries and values that can be either a specific type or a list of items of that type.
 
+## DRF Extra Fields
+
+The [drf-extra-fields][drf-extra-fields] package provides extra serializer fields for REST framework, including `Base64ImageField` and `PointField` classes.
+
+
+
 [cite]: https://docs.djangoproject.com/en/dev/ref/forms/api/#django.forms.Form.cleaned_data
 [FILE_UPLOAD_HANDLERS]: https://docs.djangoproject.com/en/dev/ref/settings/#std:setting-FILE_UPLOAD_HANDLERS
 [ecma262]: http://ecma-international.org/ecma-262/5.1/#sec-15.9.1.15
 [strftime]: http://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior
 [iso8601]: http://www.w3.org/TR/NOTE-datetime
 [drf-compound-fields]: http://drf-compound-fields.readthedocs.org
+[drf-extra-fields]: https://github.com/Hipo/drf-extra-fields
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