diff --git a/docs/readthedocs/source/doc/PythonAPI/Chronos/tsdataset.rst b/docs/readthedocs/source/doc/PythonAPI/Chronos/tsdataset.rst
index ccfc1e8b..2be5f92f 100644
--- a/docs/readthedocs/source/doc/PythonAPI/Chronos/tsdataset.rst
+++ b/docs/readthedocs/source/doc/PythonAPI/Chronos/tsdataset.rst
@@ -22,3 +22,12 @@ XShardsTSDataset can be initialized from xshards of pandas dataframe and be conv
     :members:
     :undoc-members:
     :show-inheritance:
+
+
+Built-in Dataset
+--------------------------------------------
+
+Built-in dataset can be downloaded and preprocessed by this function. Train, validation and test split is also supported.
+
+.. automodule:: bigdl.chronos.data.repo_dataset
+    :members: