diff --git a/ESP-IDF_Robot/tutorial/docs/source/overview.rst b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
index 1d4cdf97b..d89a14866 100644
--- a/ESP-IDF_Robot/tutorial/docs/source/overview.rst
+++ b/ESP-IDF_Robot/tutorial/docs/source/overview.rst
@@ -12,19 +12,19 @@ The table below summarizes GPIOs and pins reserved for operations purposes.
 +-----------+-----------+-----------+-----------+
 | GPIO | Pin | Function  | Notes |
 +======+=====+===========+===========+
-| 0    | 16  | Data      | Data      |
+| 0    | 16  | Joystick x-axis      | ADC1_CH0      |
 +------+-----+-----------+-----------+
-| 1    | 15  | Data      | Data      |
+| 1    | 15  | Joystick y-axis      | ADC1_CH1      |
 +------+-----+-----------+-----------+
-| 8    | 5   | Data      | Data      |
+| 8    | 5   | Joystick push button     | Data      |
 +------+-----+-----------+-----------+
-| 6    | 4   | Data      | Data      |
+| 6    | 4   | PWM for clockwise rotation of left-side motors     | LEDC_CHANNEL_1      |
 +------+-----+-----------+-----------+
-| 5    | 3   | Data      | Data      |
+| 5    | 3   | PWM for clockwise rotation of right-side motors     | LEDC_CHANNEL_0      |
 +------+-----+-----------+-----------+
-| 4    | 2   | Data      | Data      |
+| 4    | 2   | Data      | LEDC_CHANNEL_2      |
 +------+-----+-----------+-----------+
-| 7    | 6   | Data      | Data      |
+| 7    | 6   | Data      | LEDC_CHANNEL_3      |
 +------+-----+-----------+-----------+
 
 Schematic