diff --git a/ESP-IDF_Robot/tutorial/docs/source/overview.rst b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
index eb5e3f0eb..1dde7dd56 100644
--- a/ESP-IDF_Robot/tutorial/docs/source/overview.rst
+++ b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
@@ -39,6 +39,11 @@ In particular, **GPIO6** and **GPIO5** provide PWM to the left- and right- side
 Similarly, **GPIO4** and **GPIO7** provide PWM to the left- and right- side DC motors to rotate in a **counter-clockwise** direction.
 Changing PWM on each channel determines the speed and direction of the RC car.
 
++-----------+-------+----------+
+| GPIO Num. | State | Function |
++===========+=======+==========+
+|
+
 The following images illustrate various PWM duty cycles registered by oscilloscope (duty cycles 0%, 48% and 91%, resp.).
 
 .. figure:: _static/ESP-IDF_Robot_PWM_Duty-0.bmp