diff --git a/modules/you_done_it/ydi_networking.h b/modules/you_done_it/ydi_networking.h
index db8be659..f922f0bf 100644
--- a/modules/you_done_it/ydi_networking.h
+++ b/modules/you_done_it/ydi_networking.h
@@ -14,6 +14,7 @@ class NetworkData : Object {
 
 public:
 	enum MessageType {
+		MSG_NONE = 0u,
 		// connection management messages
 		MSG_CONNECT = 1u,
 		MSG_OK,
@@ -39,10 +40,11 @@ public:
 	};
 
 	enum NOKReason {
-		NOK_UNAUTHENTICATED,
-		NOK_UNKNOWN_MSG,
-		NOK_OUT_OF_CONTEXT, //!< this means a received message is not valid in the recipient's current context
-		NOK_INVALID_REASON //!< this means the value could not be parsed as a NOK reason, not that the reason is an invalid message.
+		NOK_UNAUTHENTICATED, //!< message sender is not known by recipient.
+		NOK_UNKNOWN_MSG, //!< message type is not valid now or ever for recipient.
+		NOK_OUT_OF_CONTEXT, //!< this means a received message type is not valid in the recipient's current state, but COULD otherwise be valid.
+		NOK_MALFORMED_ARGUMENTS, //!< message type is valid but arguments could not be interpreted.
+		NOK_INVALID_REASON //!< this means the value could not be parsed as a NOKReason, not that the reason is an invalid message. Use UNKNOWN_MSG for that.
 	};
 };
 
@@ -55,7 +57,7 @@ NetworkData::ClueID to_clue_id(zmq::message_t const &msg);
 void print_message_contents(zmq::multipart_t const &mpart);
 
 void extend_multipart(zmq::multipart_t &mpart, NetworkData::MessageType type);
-void extend_multipart(zmq::multipart_t &mpart, NetworkData::ClueID type);
+void extend_multipart(zmq::multipart_t &mpart, NetworkData::ClueID id);
 
 void extend_multipart(zmq::multipart_t &mpart, std::string const &string);
 void extend_multipart(zmq::multipart_t &mpart, std::string_view const &strv);