diff --git a/tsock_v1.c b/tsock_v1.c
index 65f5977..f164b41 100644
--- a/tsock_v1.c
+++ b/tsock_v1.c
@@ -22,7 +22,7 @@
 
 void construire_message(char *message, char motif, int lg);
 void afficher_message(char *message, int lg);
-void print_usage();
+void print_usage(char* arg0);
 
 int main (int argc, char **argv) {
   int c;
@@ -36,7 +36,7 @@ int main (int argc, char **argv) {
     switch (c) {
       case 'p':
         if (source == 1) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1);
         }
         source = 0;
@@ -44,7 +44,7 @@ int main (int argc, char **argv) {
 
       case 's':
         if (source == 0) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1) ;
         }
         source = 1;
@@ -59,7 +59,7 @@ int main (int argc, char **argv) {
         break;
 
       default:
-        print_usage();
+        print_usage(argv[0]);
         exit(1);
     }
   }
@@ -73,7 +73,7 @@ int main (int argc, char **argv) {
   char* message = malloc(BASE_SIZE * sizeof(char));
 
   if (source == -1) {
-    print_usage();
+    print_usage(argv[0]);
     exit(1) ;
   }
 
@@ -179,8 +179,8 @@ void afficher_message(char *message, int lg) {
   printf("\n");
 }
 
-void print_usage() {
-  printf("usage: tsock_v1 <-u> [-ps] [host] <port>\n");
+void print_usage(char* arg0) {
+  printf("usage: %s <-u> [-ps] [host] <port>\n", arg0);
   printf("parameters: host  With -s, address of the host to connect to. Required with -s.\n");
   printf("            port  Port to connect or bind to. Required.\n");
   printf("options: -p       Runs a TCP/UDP sink. Incompatible with -s.\n");
diff --git a/tsock_v2.c b/tsock_v2.c
index 0fcbc07..bb381d8 100644
--- a/tsock_v2.c
+++ b/tsock_v2.c
@@ -21,7 +21,7 @@
 
 void construire_message(char *message, char motif, int lg);
 void afficher_message(char *message, int lg);
-void print_usage();
+void print_usage(char* arg0);
 
 int main (int argc, char **argv) {
   int c;
@@ -35,7 +35,7 @@ int main (int argc, char **argv) {
     switch (c) {
       case 'p':
         if (source == 1) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1);
         }
         source = 0;
@@ -43,7 +43,7 @@ int main (int argc, char **argv) {
 
       case 's':
         if (source == 0) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1) ;
         }
         source = 1;
@@ -58,7 +58,7 @@ int main (int argc, char **argv) {
         break;
 
       default:
-        print_usage();
+        print_usage(argv[0]);
         exit(1);
     }
   }
@@ -72,7 +72,7 @@ int main (int argc, char **argv) {
   char* message = malloc(BASE_SIZE * sizeof(char));
 
   if (source == -1) {
-    print_usage();
+    print_usage(argv[0]);
     exit(1) ;
   }
 
@@ -262,8 +262,8 @@ void afficher_message(char *message, int lg) {
 }
 
 
-void print_usage() {
-  printf("usage: tsock_v2 [-psu] [host] <port>\n");
+void print_usage(char* arg0) {
+  printf("usage: %s [-psu] [host] <port>\n", arg0);
   printf("parameters: host  With -s, address of the host to connect to. Required with -s.\n");
   printf("            port  Port to connect or bind to. Required.\n");
   printf("options: -p       Runs a TCP/UDP sink. Incompatible with -s.\n");
diff --git a/tsock_v3.c b/tsock_v3.c
index 94b1268..5968d4f 100644
--- a/tsock_v3.c
+++ b/tsock_v3.c
@@ -30,7 +30,7 @@ void afficher_message_reception(char *message, int lg, int numero_envoi);
 int count_digits(int lg); 
 
 // Affiche l'usage de l'outil
-void print_usage();
+void print_usage(char* arg0);
 
 
 int main (int argc, char **argv)
@@ -47,7 +47,7 @@ int main (int argc, char **argv)
     switch (c) {
       case 'p':
         if (source == 1) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1);
         }
         source = 0;
@@ -55,7 +55,7 @@ int main (int argc, char **argv)
 
       case 's':
         if (source == 0) {
-          print_usage();
+          print_usage(argv[0]);
           exit(1) ;
         }
         source = 1;
@@ -94,7 +94,7 @@ int main (int argc, char **argv)
         break;
 
       default:
-        print_usage();
+        print_usage(argv[0]);
         exit(1);
     }
   }
@@ -115,7 +115,7 @@ int main (int argc, char **argv)
 
 
   if (source == -1) {
-    print_usage();
+    print_usage(argv[0]);
     exit(1) ;
   }
 
@@ -357,8 +357,8 @@ int count_digits(int lg) {
   return retour;
 }
 
-void print_usage() {
-  printf("usage: tsock_v3 [-psu] [-n nb_messages] [-l mess_length] [host] <port>\n");
+void print_usage(char* arg0) {
+  printf("usage: %s [-psu] [-n nb_messages] [-l mess_length] [host] <port>\n", arg0);
   printf("parameters: host         With -s, address of the host to connect to. Required with -s.\n");
   printf("            port         Port to connect or bind to. Required.\n");
   printf("options: -l mess_length  Size of the messages to send. Min 5. Max 1400. Default 30.\n");