diff --git a/gcaptchaz.c b/gcaptchaz.c
index 9f5404a..9fbe984 100644
--- a/gcaptchaz.c
+++ b/gcaptchaz.c
@@ -203,6 +203,9 @@ static void usage()
     printf("\t-s STRING\n");    
     printf("\t-i : inverse\n");    
     printf("\t-h : help\n");
+    printf("\nLICENCE : Copyleft, Licence Art Libre (http://artlibre.org/licence/lal)\n");
+    printf("Copyright Grégory Soutadé (2012)\n");
+    printf("Copyright Loz (2007)\n");
 }
 
 int main(int argc, char** argv)