diff --git a/README.md b/README.md
index 156fc80..3bc811f 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,9 @@ vi lutim.conf
 * hosted\_by: if someone hosts your LUTIm instance, you can add some HTML (a logo for example) to make it appear on index page ;
 * tweet\_card\_via: a twitter account which will appear on twitter cards ;
 * max\_file\_size: well, this is explicit (default is 10Mio = 10485760 octets) ;
-* https: 1 if you want to provide secure images URLs.
+* https: 1 if you want to provide secure images URLs (default is 0) ;
+* stats\_day\_num: when you generate statistics with `script/lutim cron stats`, you will have stats for the last `stats_day_num` days (default is 365) ;
+* keep\_ip\_during: when you delete IP addresses of image's senders with `script/lutim cron cleanbdd`, the IP addresses of images older than `keep_ip_during` days will be deleted (default is 365) ;
 
 ##Usage
 ```
@@ -81,6 +83,27 @@ sub vcl_recv {
 }
 ```
 
+##Cron jobs
+LUTIm have commands which can be used in cron jobs.
+
+To see what commands are available:
+```shell
+carton exec script/lutim cron
+```
+
+###Statistics
+To generate statistics which can be viewed at the address `/stats`:
+```shell
+carton exec script/lutim cron stats
+```
+
+###Delete IP adresses from database
+To automatically delete the IP addresses of image's senders after a configurable delay:
+```shell
+carton exec script/lutim cron cleanbdd
+```
+
+
 ##Shutter integration
 See where Shutter (<http://en.wikipedia.org/wiki/Shutter_%28software%29>) keeps its plugins on your computer.
 On my computer, it's in `/usr/share/shutter/resources/system/upload_plugins/upload`.
diff --git a/lib/Mojolicious/Command/cron/cleanbdd.pm b/lib/Mojolicious/Command/cron/cleanbdd.pm
new file mode 100644
index 0000000..4532110
--- /dev/null
+++ b/lib/Mojolicious/Command/cron/cleanbdd.pm
@@ -0,0 +1,38 @@
+package Mojolicious::Command::cron::cleanbdd;
+use Mojo::Base 'Mojolicious::Command';
+use LutimModel;
+use Mojo::Util qw(slurp decode);
+use Mojolicious::Plugin::Config;
+
+has description => 'Delete IP addresses from database after configured delay.';
+has usage => sub { shift->extract_usage };
+
+sub run {
+    my $c = shift;
+
+    my $config = Mojolicious::Plugin::Config->parse(decode('UTF-8', slurp 'lutim.conf'), 'lutim.conf');
+
+    $config->{keep_ip_during} = (defined($config->{keep_ip_during})) ? $config->{keep_ip_during} : 365;
+
+    my $separation = time() - $config->{keep_ip_during} * 86400;
+
+    LutimModel->do(
+        'UPDATE lutim SET created_by = "" WHERE path IS NOT NULL AND created_at < ?',
+        {},
+        $separation
+    );
+}
+
+=encoding utf8
+
+=head1 NAME
+
+Mojolicious::Command::cron::cleanbdd - Delete IP addresses from database after configured delay
+
+=head1 SYNOPSIS
+
+  Usage: script/lutim cron cleanbdd
+
+=cut
+
+1;
diff --git a/lutim.conf.template b/lutim.conf.template
index 1d33e89..9bf6388 100644
--- a/lutim.conf.template
+++ b/lutim.conf.template
@@ -16,5 +16,6 @@
     max_file_size  =>  10485760,  # optional, size in octets, you can write it 10*1024*1024
     #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
+    #stats_day_num  => 365, # optional, number of days shown in /stats page (used with script/lutim cron stats)
+    #keep_ip_during => 365, # optional, number of days, after that delay, the IP addresses of image creators will be deleted (used with script/lutim cron cleanbdd)
 };