diff --git a/include/constant.php b/include/constant.php
index 2f743e4b7..e64d5b4dd 100644
--- a/include/constant.php
+++ b/include/constant.php
@@ -29,6 +29,8 @@ $_ENV['TMP']="/tmp";
 define ("phpcompta_password","dany");
 define ("phpcompta_psql_port","5432");
 define ("phpcompta_user","phpcompta");
+//
+// the domain can't start by a number !!!
 define ("domaine","");
 define ("MAX_COMPTE",4);