diff --git a/components/bt/controller/esp32c3/Kconfig.in b/components/bt/controller/esp32c3/Kconfig.in
index 6f308d805b..1ebd78ea7a 100644
--- a/components/bt/controller/esp32c3/Kconfig.in
+++ b/components/bt/controller/esp32c3/Kconfig.in
@@ -4,11 +4,13 @@ config BT_CTRL_MODE_EFF
 
 config BT_CTRL_BLE_MAX_ACT
     int "BLE Max Instances"
-    default 10
+    default 6
     range 1 10
     help
         BLE maximum activities of bluetooth controller，both of connections,
-        scan , sync and adv(periodic adv, multi-adv).
+        scan , sync and adv(periodic adv, multi-adv). Each instance needs to
+        consume 828 bytes, you can save RAM by modifying the instance value
+        according to actual needs.
 
 config BT_CTRL_BLE_MAX_ACT_EFF
     int
diff --git a/examples/bluetooth/bluedroid/ble_50/multi-adv/main/multi_adv_demo.c b/examples/bluetooth/bluedroid/ble_50/multi-adv/main/multi_adv_demo.c
index b3fb958afa..8c066272a9 100644
--- a/examples/bluetooth/bluedroid/ble_50/multi-adv/main/multi_adv_demo.c
+++ b/examples/bluetooth/bluedroid/ble_50/multi-adv/main/multi_adv_demo.c
@@ -251,7 +251,7 @@ void app_main(void)
     FUNC_SEND_WAIT_SEM(esp_ble_gap_config_ext_adv_data_raw(2, sizeof(legacy_adv_data), &legacy_adv_data[0]), test_sem);
     FUNC_SEND_WAIT_SEM(esp_ble_gap_config_ext_scan_rsp_data_raw(2, sizeof(legacy_scan_rsp_data), &legacy_scan_rsp_data[0]), test_sem);
 
-    // coded phy extend adv, Connectable advertising
+    // coded phy extend adv, Scannable advertising
     FUNC_SEND_WAIT_SEM(esp_ble_gap_ext_adv_set_params(3, &ext_adv_params_coded), test_sem);
     FUNC_SEND_WAIT_SEM(esp_ble_gap_ext_adv_set_rand_addr(3, addr_coded), test_sem);
     FUNC_SEND_WAIT_SEM(esp_ble_gap_config_ext_scan_rsp_data_raw(3, sizeof(raw_scan_rsp_data_coded), &raw_scan_rsp_data_coded[0]), test_sem);