AsyncBridge: Comment why we don't checkException in loop

include/asynchronousBridge.h

@@ -31,6 +31,16 @@ public:
 			io_service.run_one();
 			if (isAsyncOperationComplete.load() || io_service.stopped())
 				{ break; }
+
+			/**	EXPLANATION:
+			 * In the mrntt and mind thread loops we call checkException() after
+			 * run() returns, but we don't have to do that here because
+			 * setException() calls stop.
+			 *
+			 * So if an exception is set on our thread, we'll break out of this
+			 * loop due to the check for stopped() above, and that'll take us
+			 * back out to the main loop, where we'll catch the exception.
+			 */
 		}
 	}