diff --git a/src/RADIUS_proxy_server.cpp b/src/RADIUS_proxy_server.cpp
index e6e26226..c0ac32a1 100644
--- a/src/RADIUS_proxy_server.cpp
+++ b/src/RADIUS_proxy_server.cpp
@@ -241,7 +241,7 @@ namespace OpenWifi {
 		P.Evaluate(ReceiveSize);
 		auto SerialNumber = P.ExtractSerialNumberTIP();
 		if (SerialNumber.empty()) {
-			poco_warning(Logger(), "CoA/DM: missing serial number.");
+			poco_warning(Logger(), "CoA/DM: missing serial number. Dropping request.");
 			return;
 		}
 		auto CallingStationID = P.ExtractCallingStationID();