diff --git a/docs/en/general-notes/index.rst b/docs/en/general-notes/index.rst
index 68a310ec..01ae81be 100644
--- a/docs/en/general-notes/index.rst
+++ b/docs/en/general-notes/index.rst
@@ -14,16 +14,8 @@ and now upgrade to the new SDK, please disable the following configuration in th
 
     "Bootloader config  --->
         [ ] Bootloader init SPI flash"
- 
-2. Sniffer or Smartconfig
-^^^^^^^^^^^^^^^^^^^^^^^^^
 
-We moved some functions from IRAM to flash, including `malloc` and `free` fucntions, to save more memory.
-In this case, please do not read/write/erase flash during sniffer/promiscuous mode.
-
-You need to disable the sniffer/promiscuous mode at first, then read/write/erase flash. 
-
-3. ESP8285 or ESP8266 + 1MB flash
+2. ESP8285 or ESP8266 + 1MB flash
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 ESP8285 or ESP8266 + 1MB flash can use "Copy OTA Mode" for OTA, more details are in the `examples/system/ota <https://github.com/espressif/ESP8266_RTOS_SDK/tree/master/examples/system/ota/>`_.