diff --git a/components/bt/host/bluedroid/api/include/api/esp_gap_ble_api.h b/components/bt/host/bluedroid/api/include/api/esp_gap_ble_api.h
index 80173adacd..0eb2b4a37e 100644
--- a/components/bt/host/bluedroid/api/include/api/esp_gap_ble_api.h
+++ b/components/bt/host/bluedroid/api/include/api/esp_gap_ble_api.h
@@ -2730,15 +2730,17 @@ esp_err_t esp_ble_gap_periodic_adv_stop(uint8_t instance);
 esp_err_t esp_ble_gap_set_ext_scan_params(const esp_ble_ext_scan_params_t *params);
 
 /**
-* @brief           This function is used to enable scanning.
+* @brief           Enables extended scanning.
 *
-* @param[in]       duration  Scan duration time, where Time = N * 10 ms. Range: 0x0001 to 0xFFFF.
-* @param[in]       period    Time interval from when the Controller started its last Scan Duration until it begins the subsequent Scan Duration.
-*                            Time = N * 1.28 sec. Range: 0x0001 to 0xFFFF.
+* @param[in]       duration  Scan duration in units of 10 ms.
+*                            - Range: 0x0001 to 0xFFFF (Time = N * 10 ms).
+*                            - 0x0000: Scan continuously until explicitly disabled.
 *
+* @param[in]       period    Time interval between the start of consecutive scan durations, in units of 1.28 seconds.
+*                            - Range: 0x0001 to 0xFFFF (Time = N * 1.28 sec).
+*                            - 0x0000: Scan continuously.
 * @return            - ESP_OK : success
 *                    - other  : failed
-*
 */
 esp_err_t esp_ble_gap_start_ext_scan(uint32_t duration, uint16_t period);