diff --git a/lib/Lutim.pm b/lib/Lutim.pm
index 8dbb4b2..279cc82 100644
--- a/lib/Lutim.pm
+++ b/lib/Lutim.pm
@@ -23,6 +23,8 @@ sub startup {
     $config->{provis_step}   = 5   unless (defined($config->{provis_step}));
     $config->{length}        = 8   unless (defined($config->{length}));
 
+    die "You need to provide a contact information in lutim.conf !" unless (defined($config->{contact}));
+
     $ENV{MOJO_MAX_MESSAGE_SIZE} = $config->{max_file_size} if (defined($config->{max_file_size}));
 
     $self->secrets($config->{secrets});
diff --git a/lutim.conf.template b/lutim.conf.template
index 495d6ac..a83f8f3 100644
--- a/lutim.conf.template
+++ b/lutim.conf.template
@@ -6,14 +6,14 @@
         user   => 'www-data',
         group  => 'www-data'
     },
-    contact           => 'John Doe, admin[at]example.com',
+    #contact           => 'John Doe, admin[at]example.com',
     secrets           => ['fdjsofjoihrei'], # please provide a random string
-    piwik_img         => 'https://piwik.example.org/piwik.php?idsite=1&rec=1', # optional, only the piwik image tracker is allowed, no javascript
     length            => 8, # optional
     provis_step       => 5, # optional
     provisioning      => 100, # optional
     tweet_card_via    => '@framasky', # optional
     max_file_size     => 10485760,  # optional, size in octets, you can write it 10*1024*1024
+    #piwik_img         => 'https://piwik.example.org/piwik.php?idsite=1&rec=1', # optional, only the piwik image tracker is allowed, no javascript
     #hosted_by         => 'My super hoster <img src="http://hoster.example.com" alt="Hoster logo">', # optional
     #https             => 0, # optional, set to 1 if you use Lutim behind a secure web server
     #stats_day_num     => 365, # optional, number of days shown in /stats page (used with script/lutim cron stats)