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--- a/CommonIO.def.m2cc
+++ b/CommonIO.def.m2cc
@@ -13,6 +13,10 @@
   (*   GM2  : Parameter werden fuer den GNU Modula-2 Compilter gesetzt      *)
   (*                                                                        *)
   (* Kontrolliert die IO-Module TIO,FIO,SIO sowie Streams                   *)
+  (*                                                                        *)
+  (* Controls the IO-Module TIO,FIO,SIO and Streams, not for direct use     *)
+  (* There are two version contained - one for XDS and on for GM2, they can *)
+  (* obtained with the m2cc command line shown above                        *)
   (*------------------------------------------------------------------------*)
   (* Offene Punkte                                                          *)
   (*                                                                        *)