diff --git a/README.md b/README.md
index fed47d0..c9eb6d9 100644
--- a/README.md
+++ b/README.md
@@ -83,3 +83,5 @@ Example usage of v4 :
   - [X] server can handle multiple requests simultaneously
   - [X] server doesn't stop after the connection ends
   - [X] both client and server can assume sender/receiver roles
+
+Every version is fully functional.
diff --git a/tsock_v1.c b/tsock_v1.c
index f164b41..f60ba59 100644
--- a/tsock_v1.c
+++ b/tsock_v1.c
@@ -72,7 +72,8 @@ int main (int argc, char **argv) {
 
   char* message = malloc(BASE_SIZE * sizeof(char));
 
-  if (source == -1) {
+  // At least one option -s or -u required. UDP is also required for this version.
+  if (source == -1 || !udp) {
     print_usage(argv[0]);
     exit(1) ;
   }
@@ -95,7 +96,7 @@ int main (int argc, char **argv) {
       nb_message = 10 ;
       printf("nb de tampons à envoyer = 10 par défaut\n");
     } else
-      printf("nb de tampons à envoyer = infini\n");
+      printf("nb de tampons à recevoir = infini\n");
   }
 
   if (udp==1){
diff --git a/tsock_v2.c b/tsock_v2.c
index bb381d8..1c4d2c0 100644
--- a/tsock_v2.c
+++ b/tsock_v2.c
@@ -92,7 +92,7 @@ int main (int argc, char **argv) {
       nb_message = 10 ;
       printf("nb de tampons à envoyer = 10 par défaut\n");
     } else
-      printf("nb de tampons à envoyer = infini\n");
+      printf("nb de tampons à recevoir = infini\n");
   }
 
   if (udp==1){