diff --git a/readme.md b/readme.md
index d035da3..0339aaa 100644
--- a/readme.md
+++ b/readme.md
@@ -299,11 +299,13 @@ Note: If your model are listed in native tab, you can use [my native folder](htt
 ##
 
 ### Extract metadata
-You can get metadata from deepstream in Python and C++. For C++, you need edit deepstream-app or deepstream-test code. For Python your need install and edit deepstream_python_apps.
 
-You need manipulate NvDsObjectMeta (Python/C++), NvDsFrameMeta (Python/C++) and NvOSD_RectParams (Python/C++) to get label, position, etc. of bboxs.
+You can get metadata from deepstream in Python and C++. For C++, you need edit deepstream-app or deepstream-test code. For Python your need install and edit [deepstream_python_apps](https://github.com/NVIDIA-AI-IOT/deepstream_python_apps).
 
-In C++ deepstream-app application, your code need be in analytics_done_buf_prob function. In C++/Python deepstream-test application, your code need be in osd_sink_pad_buffer_probe/tiler_src_pad_buffer_probe function.
+You need manipulate NvDsObjectMeta ([Python](https://docs.nvidia.com/metropolis/deepstream/python-api/PYTHON_API/NvDsMeta/NvDsObjectMeta.html)/[C++](https://docs.nvidia.com/metropolis/deepstream/sdk-api/Meta/_NvDsObjectMeta.html)), NvDsFrameMeta ([Python](https://docs.nvidia.com/metropolis/deepstream/python-api/PYTHON_API/NvDsMeta/NvDsFrameMeta.html)/[C++](https://docs.nvidia.com/metropolis/deepstream/sdk-api/Meta/_NvDsFrameMeta.html)) and NvOSD_RectParams ([Python](https://docs.nvidia.com/metropolis/deepstream/python-api/PYTHON_API/NvDsOSD/NvOSD_RectParams.html)/[C++](https://docs.nvidia.com/metropolis/deepstream/sdk-api/OSD/Data_Structures/_NvOSD_FrameRectParams.html)) to get label, position, etc. of bboxs.
+
+In C++ deepstream-app application, your code need be in analytics_done_buf_prob function.
+In C++/Python deepstream-test application, your code need be in osd_sink_pad_buffer_probe/tiler_src_pad_buffer_probe function.
 
 Python is slightly slower than C (about 5-10%).