diff --git a/python/paddle/v2/data_feeder.py b/python/paddle/v2/data_feeder.py
index 56976baa3d523ec878a8470cfc280a4093f62ddf..ca3e44e5a0187da33654f4955197196b150da196 100644
--- a/python/paddle/v2/data_feeder.py
+++ b/python/paddle/v2/data_feeder.py
@@ -39,9 +39,8 @@ class DataFeeder(DataProviderConverter):
 
     ..  code-block:: python
 
-        data_types = [('image', paddle.data_type.dense_vector(784)),
-                      ('label', paddle.data_type.integer_value(10))]
         feeding = ['image', 'label']
+        data_types = enumerate_data_types_of_data_layers(topology)
         feeder = DataFeeder(data_types=data_types, feeding=feeding)
 
         minibatch_data = [([1.0, 2.0, 3.0, ...], 5)]
diff --git a/python/paddle/v2/trainer.py b/python/paddle/v2/trainer.py
index a207beb548f0fda6d7aacf5c55e53d937e18a924..f5797a86c2b71502a7791453ff86c6a486c9f185 100644
--- a/python/paddle/v2/trainer.py
+++ b/python/paddle/v2/trainer.py
@@ -81,7 +81,7 @@ class SGD(object):
         :type event_handler: (BaseEvent) => None
         :param feeding: Feeding is a map of neural network input name and array
                         index that reader returns.
-        :type feeding: dict
+        :type feeding: dict|list
         :return:
         """
         if event_handler is None: