async_logger comments

include/spdlog/async_logger.h

@@ -24,10 +24,13 @@
 
 #pragma once
 
-// Async logger
+// Very fast asynchronous logger (millions of logs per second on aregular desktop)
+// Uses pre allocated lockfree queue for maximum throughput even under large number of threads.
 // Upon each log write the logger:
 //    1. Checks if its log level is enough to log the message
-// 2. Push a new copy of the message to a queue (uses sinks::async_sink for this)
+//    2. Push a new copy of the message to a queue or block the caller until space is available
+//    3. will throw spdlog_ex upon exceptions
+// Upong destruction, logs all remaining messages in the queue before destructing..
 
 #include <chrono>
 #include "common.h"