diff --git a/en/guide/configuration_file.md b/en/guide/configuration_file.md
index 938f75b..b5529b0 100644
--- a/en/guide/configuration_file.md
+++ b/en/guide/configuration_file.md
@@ -171,3 +171,15 @@ Example:
 [gazebo]
 camtopic=~/typhoon_h480/cgo3_camera_link/camera/image
 ```
+
+### [rtsp]
+
+Key | Description | Default
+-- | --- | ---
+`pipeline` | a gstreamer pipeline for encoding the the pipeline to be used for transmitting. For example, it's used int the ubuntu.conf example.| <empty>
+
+[ubuntu.conf full example](https://github.com/Dronecode/camera-manager/tree/master/samples/config/ubuntu.conf)
+```shell
+[rtsp]
+pipeline=v4l2src device=/dev/video0 ! videoconvert ! video/x-raw, format=I420 ! x264enc speed-preset=ultrafast tune=zerolatency ! rtph264pay name=pay0
+```