diff --git a/examples/bluetooth/bluedroid/ble/gatt_server_service_table/main/gatts_table_creat_demo.c b/examples/bluetooth/bluedroid/ble/gatt_server_service_table/main/gatts_table_creat_demo.c
index 4bf45444a3..669b52d7d1 100644
--- a/examples/bluetooth/bluedroid/ble/gatt_server_service_table/main/gatts_table_creat_demo.c
+++ b/examples/bluetooth/bluedroid/ble/gatt_server_service_table/main/gatts_table_creat_demo.c
@@ -404,6 +404,11 @@ static void gatts_profile_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_
                         {
                             indicate_data[i] = i % 0xff;
                         }
+
+                        // if want to change the value in server database, call:
+                        // esp_ble_gatts_set_attr_value(heart_rate_handle_table[IDX_CHAR_VAL_A], sizeof(indicate_data), indicate_data);
+
+
                         //the size of indicate_data[] need less than MTU size
                         esp_ble_gatts_send_indicate(gatts_if, param->write.conn_id, heart_rate_handle_table[IDX_CHAR_VAL_A],
                                             sizeof(indicate_data), indicate_data, true);
diff --git a/examples/bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md b/examples/bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md
index 6c47d91867..a61f01661a 100644
--- a/examples/bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md
+++ b/examples/bluetooth/bluedroid/ble/gatt_server_service_table/tutorial/Gatt_Server_Service_Table_Example_Walkthrough.md
@@ -158,6 +158,7 @@ The application registration takes place inside ``app_main()`` using the ``esp_b
 ```c
 esp_ble_gatts_app_register(ESP_HEART_RATE_APP_ID);
 ```
+The ``ESP_HEART_RATE_APP_ID`` serves as an application ID, distinguishing between various application layer callbacks. This identifier corresponds to the ``app_id`` found within the ``gatts_reg_evt_param`` in ESP_GATTS_REG_EVT.
 
 ## Setting GAP Parameters