diff --git a/components/bt/controller/esp32c3/Kconfig.in b/components/bt/controller/esp32c3/Kconfig.in
index c3c6857ba2..195d66ce7a 100644
--- a/components/bt/controller/esp32c3/Kconfig.in
+++ b/components/bt/controller/esp32c3/Kconfig.in
@@ -7,7 +7,8 @@ config BT_CTRL_BLE_MAX_ACT
     default 10
     range 1 10
     help
-        BLE maximum instances of bluetooth controller.
+        BLE maximum activities of bluetooth controller，both of connections,
+        scan , sync and adv(periodic adv, multi-adv).
 
 config BT_CTRL_BLE_MAX_ACT_EFF
     int
diff --git a/components/bt/host/bluedroid/api/include/api/esp_gattc_api.h b/components/bt/host/bluedroid/api/include/api/esp_gattc_api.h
index d0a2332b6b..70a9b1536a 100644
--- a/components/bt/host/bluedroid/api/include/api/esp_gattc_api.h
+++ b/components/bt/host/bluedroid/api/include/api/esp_gattc_api.h
@@ -313,7 +313,7 @@ esp_err_t esp_ble_gattc_app_unregister(esp_gatt_if_t gattc_if);
  * @param[in]       gattc_if: Gatt client access interface.
  * @param[in]       remote_bda: remote device bluetooth device address.
  * @param[in]       remote_addr_type: remote device bluetooth device the address type.
- * @param[in]       is_direct: direct connection or background auto connection
+ * @param[in]       is_direct: direct connection or background auto connection(by now, background auto connection is not supported).
  *
  * @return
  *                  - ESP_OK: success
diff --git a/components/bt/include/esp32/include/esp_bt.h b/components/bt/include/esp32/include/esp_bt.h
index 2ef326b04a..c577fd65a7 100644
--- a/components/bt/include/esp32/include/esp_bt.h
+++ b/components/bt/include/esp32/include/esp_bt.h
@@ -488,6 +488,7 @@ esp_err_t esp_bt_sleep_disable(void);
  * Note that scan duplicate list will be automatically cleared when the maximum amount of device in the filter is reached
  * the amount of device in the filter can be configured in menuconfig.
  *
+ * @note This function name is incorrectly spelled, it will be fixed in release 5.x version.
  *
  * @return
  *                  - ESP_OK : success