diff --git a/secure/simul_efun/comm.c b/secure/simul_efun/comm.c
index d25d756..07ffeb6 100644
--- a/secure/simul_efun/comm.c
+++ b/secure/simul_efun/comm.c
@@ -1,5 +1,14 @@
 #include <living/comm.h>
 
+// Eine grundlegende Struct fuer Nachrichten an Livings, welche alle
+// Programme benutzen koennen.
+public struct wave_s
+{
+  string msg;
+  int    type;
+  string prefix;
+};
+
 // Sendet an alle Objekte in room und room selber durch Aufruf von
 // ReceiveMsg().
 varargs void send_room(object|string room, string msg, int msg_type,