diff --git a/cg/cg4.cpp b/cg/cg4.cpp
index 45a7092bb..1ed14738e 100755
--- a/cg/cg4.cpp
+++ b/cg/cg4.cpp
@@ -3,7 +3,7 @@
 
 #include "cg4.h"
 
-const char* const usage = "Errore - uso : %s -{0,2,3,4,5}";
+const char* const usage = "Errore - uso : %s -{0|1|2|3|4|5}";
 
 int main(int argc,char** argv)
 {
@@ -13,6 +13,8 @@ int main(int argc,char** argv)
   {
   case 0:
     cg4100(argc,argv); break;
+  case 1:
+    cg4200(argc,argv); break;
   case 2:
     cg4300(argc,argv); break;
   case 3: