diff --git a/components/hal/include/hal/adc_types.h b/components/hal/include/hal/adc_types.h
index 5070f75d76..bbe3d08e2f 100644
--- a/components/hal/include/hal/adc_types.h
+++ b/components/hal/include/hal/adc_types.h
@@ -134,7 +134,7 @@ typedef struct {
 #endif
             uint8_t channel:   4;   /*!< ADC channel index. */
         };
-        uint8_t val;
+        uint8_t val;                /*!<Raw data value */
     };
 } adc_digi_pattern_table_t;
 
diff --git a/components/tinyusb/additions/include/tusb_cdc_acm.h b/components/tinyusb/additions/include/tusb_cdc_acm.h
index 4e4001f1c4..b5f5801951 100644
--- a/components/tinyusb/additions/include/tusb_cdc_acm.h
+++ b/components/tinyusb/additions/include/tusb_cdc_acm.h
@@ -74,9 +74,9 @@ typedef enum {
 typedef struct {
     cdcacm_event_type_t type; /*!< Event type */
     union {
-        cdcacm_event_rx_wanted_char_data_t rx_wanted_char_data;
-        cdcacm_event_line_state_changed_data_t line_state_changed_data;
-        cdcacm_event_line_coding_changed_data_t line_coding_changed_data;
+        cdcacm_event_rx_wanted_char_data_t rx_wanted_char_data; /*!< Data input of the `callback_rx_wanted_char` callback */
+        cdcacm_event_line_state_changed_data_t line_state_changed_data; /*!< Data input of the `callback_line_state_changed` callback */
+        cdcacm_event_line_coding_changed_data_t line_coding_changed_data; /*!< Data input of the `line_coding_changed` callback */
     };
 } cdcacm_event_t;