diff --git a/README.md b/README.md
index 1348192..1b5b9cc 100755
--- a/README.md
+++ b/README.md
@@ -12,3 +12,13 @@ $blocklog("monObjet", $id_objet, $num_dossier, $chaine);
 ```
 ?page=sha256sum
 ```
+
+## options :
+```php
+//changer l'algorithme par defaut : sha256
+define("_BLOCKLOG_ALGO", 'sha256');
+
+//activer les log : blocklog.log
+define("_DEBUG_BLOCKLOG", true);
+
+```