diff --git a/ESP-IDF_Robot/tutorial/docs/source/progress.rst b/ESP-IDF_Robot/tutorial/docs/source/progress.rst
index a220313c9..8be611d3a 100644
--- a/ESP-IDF_Robot/tutorial/docs/source/progress.rst
+++ b/ESP-IDF_Robot/tutorial/docs/source/progress.rst
@@ -6,6 +6,9 @@ Finished Work
 
 .. image:: _static/ESP-IDF_Robot.jpg
 
+Chassis
+-------
+
 .. figure:: _static/chassi-progress_002d.jpg
    :height: 750px
    :align: right