diff --git a/examples/echo_server/echo_server.cpp b/examples/echo_server/echo_server.cpp
index 39bc47e71bba436c55ab354c371b5cf51660d321..7d90a4017a0bba97bbb875feb2de4249ca2e65a7 100644
--- a/examples/echo_server/echo_server.cpp
+++ b/examples/echo_server/echo_server.cpp
@@ -296,7 +296,7 @@ int main(int argc, const char* argv[])
 		{
 //			/*
 			//broadcast series functions call pack_msg for each client respectively, because clients may used different protocols(so different type of packers, of course)
-			normal_server_.broadcast_msg(str.data(), str.size() + 1, false);
+			normal_server_.broadcast_msg(str.data(), str.size() + 1);
 			//send \0 character too, because demo client used basic_buffer as its msg type, it will not append \0 character automatically as std::string does,
 			//so need \0 character when printing it.
 //			*/
@@ -307,11 +307,13 @@ int main(int argc, const char* argv[])
 			//send \0 character too, because demo client used basic_buffer as its msg type, it will not append \0 character automatically as std::string does,
 			//so need \0 character when printing it.
 			if (!msg.empty())
-				normal_server_.do_something_to_all([&msg](server_base<normal_socket>::object_ctype& item) {item->direct_send_msg(msg);});
+				((normal_server&) normal_server_).do_something_to_all([&msg](server_base<normal_socket>::object_ctype& item) {item->direct_send_msg(msg);});
 			*/
 			/*
 			//if demo client is using stream_unpacker
-			normal_server_.do_something_to_all([&str](server_base<normal_socket>::object_ctype& item) {item->direct_send_msg(str);});
+			((normal_server&) normal_server_).do_something_to_all([&str](server_base<normal_socket>::object_ctype& item) {item->direct_send_msg(str);});
+			//or
+			normal_server_.broadcast_native_msg(str);
 			*/
 		}
 	}
diff --git a/include/ascs/config.h b/include/ascs/config.h
index 49dca4a649aa47f2027078478853ad25b181e446..066b93358e9d75420014bb5aa84d875817247c47 100644
--- a/include/ascs/config.h
+++ b/include/ascs/config.h
@@ -607,6 +607,7 @@
  * 2020.x.x		version 1.5.0
  *
  * SPECIAL ATTENTION (incompatible with old editions):
+ * Add a new parameter prior to send_msg (series) function (after can_overflow).
  * Delete macro ASCS_ENHANCED_STABILITY, which means now we always have it, if you really don't want it, define macro ASCS_NO_TRY_CATCH.
  * Change macro ASCS_LLF from %lu or %llu to %ld or %lld, this can shorten the output during printing invalid ids ((uint_fast64_t) -1).
  * Apply the same reconnecting mechanism for message unpacking error (before, we always disabled reconnecting mechanism).