Udpated README

README.md

@@ -181,7 +181,7 @@ void async_example()
 
 ```
 ---
-#### Logger with multi targets - each with different format and log level
+#### Logger with multi sinks - each with different format and log level
 ```c++
 
 // create logger with 2 targets with different log levels and formats.
@@ -201,6 +201,22 @@ void multi_sink_example()
     logger.info("this message should not appear in the console, only in the file");
 }
 ```
+
+---
+#### Async logger with multi sinks  
+```c++
+// create asynchronous logger with 2 sinks.
+void multi_sink_example2()
+{
+    spdlog::init_thread_pool(8192, 1);
+    auto stdout_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt >();
+    auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>("mylog.txt", 1024*1024*10, 3);
+    std::vector<spdlog::sink_ptr> sinks {stdout_sink, rotating_sink};
+    auto logger = std::make_shared<spdlog::async_logger>("loggername", sinks.begin(), sinks.end(), spdlog::thread_pool(), spdlog::async_overflow_policy::block);
+    spdlog::register_logger(logger);
+}
+```
+ 
 ---
 #### User defined types
 ```c++