diff --git a/components/esp_wifi/include/esp_wifi.h b/components/esp_wifi/include/esp_wifi.h
index 969aa62d9..d638c9b3a 100644
--- a/components/esp_wifi/include/esp_wifi.h
+++ b/components/esp_wifi/include/esp_wifi.h
@@ -63,6 +63,7 @@
 #include "esp_wifi_types.h"
 #include "esp_event.h"
 #include "esp_private/esp_wifi_private.h"
+#include "esp_wifi_default.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -543,7 +544,7 @@ esp_err_t esp_wifi_get_bandwidth(wifi_interface_t ifx, wifi_bandwidth_t *bw);
   * @brief     Set primary/secondary channel of ESP32
   *
   * @attention 1. This is a special API for sniffer
-  * @attention 2. This API should be called after esp_wifi_start() or esp_wifi_set_promiscuous()
+  * @attention 2. This API should be called after esp_wifi_start() and esp_wifi_set_promiscuous()
   *
   * @param     primary  for HT20, primary is the channel number, for HT40, primary is the primary channel
   * @param     second   for HT20, second is ignored, for HT40, second is the second channel
diff --git a/components/esp_wifi/include/esp_wifi_default.h b/components/esp_wifi/include/esp_wifi_default.h
new file mode 100644
index 000000000..9d27c87a2
--- /dev/null
+++ b/components/esp_wifi/include/esp_wifi_default.h
@@ -0,0 +1,18 @@
+// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP_WIFI_DEFAULT_H
+#define _ESP_WIFI_DEFAULT_H
+
+#endif //_ESP_WIFI_DEFAULT_H
diff --git a/components/esp_wifi/lib b/components/esp_wifi/lib
index 778f38bb1..99eb8ac56 160000
--- a/components/esp_wifi/lib
+++ b/components/esp_wifi/lib
@@ -1 +1 @@
-Subproject commit 778f38bb132392057cef82139e19229bd200c89f
+Subproject commit 99eb8ac56fe651e7116744e1704e02d0d2828d88