update README.md

Author: Links2004

README.md

@@ -18,8 +18,11 @@ a WebSocket Server and Client for Arduino based on RFC6455.
  - max input length is limited to the ram size and the ```WEBSOCKETS_MAX_DATA_SIZE``` define
  - max output length has no limit (the hardware is the limit)
  - Client send big frames with mask 0x00000000 (on AVR all frames)
- - Functions called from within the context of the websocket loop might not honor `yield()` and/or `delay()`.  See [this issue](https://github.com/Links2004/arduinoWebSockets/issues/58#issuecomment-192376395) for more info and a potential workaround.
- - 
+ 
+ ##### Limitations for Async #####
+ - Functions called from within the context of the websocket event might not honor `yield()` and/or `delay()`.  See [this issue](https://github.com/Links2004/arduinoWebSockets/issues/58#issuecomment-192376395) for more info and a potential workaround.
+ - wss / SSL is not possible.
+ 
 ##### Supported Hardware #####
  - ESP8266 [Arduino for ESP8266](https://github.com/Links2004/Arduino)
  - ESP31B
@@ -46,8 +49,6 @@ The mode can be aktivated in the ```WebSockets.h``` (see WEBSOCKETS_NETWORK_TYPE
 
 [ESPAsyncTCP](https://github.com/me-no-dev/ESPAsyncTCP) libary is required.
 
-Note: in this mode wss / SSL is not possible.
-
 ### Issues ###
 Submit issues to: https://github.com/Links2004/arduinoWebSockets/issues