diff --git a/HISTORY.rst b/HISTORY.rst
index cff4ca7..bd93ca1 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,15 @@
 History
 -------
 
+0.3.4 (2017-08-17)
+~~~~~~~~~~~~~~~~~~
+
+* Py36 compatibility by switching to ``enum-compat`` from ``enum34``
+* Improvement to ``README`` by including imports in code examples
+* Defaulting ``SQLAlchemyModelFilterSet`` to use ``SQLAlchemyFilterBackend``
+* Defaulting ``PlainModelFilterSet`` to use ``PlainFilterBackend``
+* Using universal wheels for distribution
+
 0.3.3 (2017-06-15)
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..3c6e79c
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,2 @@
+[bdist_wheel]
+universal=1
diff --git a/url_filter/__init__.py b/url_filter/__init__.py
index 7762f3f..5bab113 100644
--- a/url_filter/__init__.py
+++ b/url_filter/__init__.py
@@ -4,4 +4,4 @@
 
 __author__ = 'Miroslav Shubernetskiy'
 __email__ = 'miroslav@miki725.com'
-__version__ = '0.3.3'
+__version__ = '0.3.4'
diff --git a/url_filter/filtersets/plain.py b/url_filter/filtersets/plain.py
index c6b74a2..b502f2f 100644
--- a/url_filter/filtersets/plain.py
+++ b/url_filter/filtersets/plain.py
@@ -6,6 +6,7 @@
 import six
 from django import forms
 
+from ..backends.plain import PlainFilterBackend
 from ..exceptions import SkipFilter
 from ..filters import Filter
 from ..utils import SubClassDict, dictify
@@ -31,6 +32,7 @@ class PlainModelFilterSet(BaseModelFilterSet):
     The filterset can be configured via ``Meta`` class attribute,
     very much like Django's ``ModelForm`` is configured.
     """
+    filter_backend_class = PlainFilterBackend
 
     def _build_state(self):
         return dictify(self.Meta.model)
diff --git a/url_filter/filtersets/sqlalchemy.py b/url_filter/filtersets/sqlalchemy.py
index f0e47fa..63eb27b 100644
--- a/url_filter/filtersets/sqlalchemy.py
+++ b/url_filter/filtersets/sqlalchemy.py
@@ -67,6 +67,7 @@ class SQLAlchemyModelFilterSet(BaseModelFilterSet):
     The filterset can be configured via ``Meta`` class attribute,
     very much like Django's ``ModelForm`` is configured.
     """
+    filter_backend_class = SQLAlchemyFilterBackend
 
     def _build_filter(self, name, fields):
         field = fields[name]