diff --git a/components/esp32/include/esp_wifi_internal.h b/components/esp32/include/esp_wifi_internal.h
index 5100010e52..217d5f6d1f 100644
--- a/components/esp32/include/esp_wifi_internal.h
+++ b/components/esp32/include/esp_wifi_internal.h
@@ -60,7 +60,7 @@ bool esp_wifi_internal_tx_is_stop(void);
 void esp_wifi_internal_free_rx_buffer(void* buffer);
 
 /**
-  * @brief  free the rx buffer which allocated by wifi driver
+  * @brief  transmit the buffer via wifi driver
   *
   * @attention1 TODO should modify the return type from bool to int
   * 
diff --git a/components/lwip/api/sockets.c b/components/lwip/api/sockets.c
index 47f25bb076..487bec8e8e 100755
--- a/components/lwip/api/sockets.c
+++ b/components/lwip/api/sockets.c
@@ -400,7 +400,7 @@ static void lwip_socket_drop_registered_memberships(int s);
  */ 
 static inline void esp32_tx_flow_ctrl(void)
 {
-  uint8_t _wait_delay = 0;
+  uint8_t _wait_delay = 1;
 
   while ((system_get_free_heap_size() < HEAP_HIGHWAT) || esp_wifi_internal_tx_is_stop()){
      vTaskDelay(_wait_delay/portTICK_RATE_MS);