Update ReadMe.md

tensorflow2fluid/doc/ReadMe.md

@@ -19,7 +19,7 @@
 | 13   | [tf.cond](https://www.tensorflow.org/api_docs/python/tf/cond) | [fluid.layers.ifElse](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#ifElse) | 功能一致                                                     |
 | 14   | [tf.constant](https://www.tensorflow.org/api_docs/python/tf/constant) | [fluid.layers.fill_constant](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#fill_constant) | 功能一致                                                     |
 | 15   | [tf.contrib.layers.batch_norm](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/batch_norm) | [fluid.layers.batch_norm](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#batch_norm) | 功能一致                                                     |
-| 16   | [tf.contrib.layers.flatten](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/flatten) | [fluid.layers.flatten](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#flatten) | 功能一致                                                     |
+| 16   | [tf.contrib.layers.flatten](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/flatten) | [fluid.layers.flatten](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#flatten) | （差异对比)[https://github.com/PaddlePaddle/X2Paddle/blob/master/tensorflow2fluid/doc/tf.contrib.layers.flatten.md]                                                     |
 | 17   | [tf.contrib.layers.fully_connected](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/fully_connected) | [fluid.layers.fc](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#fc) | 功能一致                                                     |
 | 18   | [tf.contrib.layers.one_hot_encoding](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/one_hot_encoding) | [fluid.layers.one_hot](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#one_hot) | 功能一致                                                     |
 | 19   | [tf.contrib.layers.softmax](https://www.tensorflow.org/api_docs/python/tf/contrib/layers/softmax) | [fluid.layers.softmax](http://paddlepaddle.org/documentation/docs/zh/1.3/api_cn/layers_cn.html#softmax) | 功能一致                                                     |