update doc

Signed-off-by: nemirorox <[email protected]>

examples/README.rst

@@ -89,7 +89,7 @@ modeling jobs. For more information, please refer this guide on
 Upgraded DSL(DSL v2) by FATE-v1.5 comes with the following major features:
 
 1. Predictions DSL may now be configured through FATE-Flow cli. Please note
-   that new DSL no longer supports automatic formation of prediction DSL;
+   that with new DSL training job will no longer automatically form prediction DSL;
    user needs to first form DSL manually with FATE-Flow cli before running
    prediction task.
 2. New components may now be added to prediction DSL;
@@ -100,6 +100,14 @@ For DSL v2 examples, please refer `dsl/v2 <./dsl/v2>`__. For examples of
 the older version, please refer `dsl/v1 <./dsl/v1>`__. This is the "federatedml-1.x-examples" in older version. Please note that
 starting at version 1.6, FATE may no longer support DSL v1.
 
+Cross Validation Task
+~~~~~~~~~~~~~~~~~~~~~~~
+
+Starting at version 1.6, cross validation tasks can output fold history data when ``output_fold_history`` is set to True.
+Output data contains either prediction ``score`` or original ``instance`` value. Please note that the ``score`` output from cross validation
+tasks may not be input to Evaluation module. All testsuites of modeling modules include demos
+on setting `cv parameters <../python/federatedml/param/cross_validation_param.py>`_.
+
 
 Benchmark Quality
 -----------------

examples/README_zh.rst

@@ -93,6 +93,15 @@ DSL是FATE提供的第一代配置和构建联邦建模任务的方式，具体
 `dsl/v1 <./dsl/v1>`__\ ，此文件夹是在过去版本中对应的"federatedml-1.x-examples"文件夹。
 需要注意的是，在FATE-v1.6或者以后的版本里面，旧版本的DSL将会被逐步移除。
 
+
+交叉验证任务
+~~~~~~~~~~~
+
+1.6及以后的版本的交叉验证任务可选输出支持训练/验证过程数据。如需要输出过程数据，请配置CV参数``output_fold_history``；
+输出数据内容可从以下两种选择：1. 训练/预测结果 2. 数据特证。需注意输出的训练/预测结果不可输入下游评估组件Evaluation.
+目前所有建模模型组件的样例集均包括使用`CV参数 <../python/federatedml/param/cross_validation_param.py>`_ 的样例。
+
+
 Benchmark Quality
 -----------------