diff --git a/ESP-IDF_Robot/main/blink_example_main.c b/ESP-IDF_Robot/main/blink_example_main.c
index 6058fd574..34c7be0da 100644
--- a/ESP-IDF_Robot/main/blink_example_main.c
+++ b/ESP-IDF_Robot/main/blink_example_main.c
@@ -733,6 +733,9 @@ static void continuous_adc_init(adc_channel_t *channel, uint8_t channel_num, adc
 
 static void motors_task (void *pvParameter) {}
 
+/*
+    EXP32-C3 Chip built-in temprature sensor
+*/
 static void chip_sensor_init () {
     temperature_sensor_handle_t temp_sensor = NULL;
     temperature_sensor_config_t temp_sensor_config = TEMPERATURE_SENSOR_CONFIG_DEFAULT(10, 50);