diff --git a/README.md b/README.md
index 242ebbc..c854538 100644
--- a/README.md
+++ b/README.md
@@ -118,10 +118,14 @@ Generate the metric file for the first time:
 /srv/statoolinfos/bin/statoolinfos probe -full /srv/statoolinfos/conf/foo.bar.org.conf
 ```
 
-Create a cron file to update the metric file everyday:
-
+Create a cron file in `/etc/cron.d/statoolinfos` to update the metric file everyday:
 ```
-1 * * * * root /srv/statoolinfos/bin/probe -previousday /srv/statoolinfos/conf/foo.bar.org.conf
+1 0,12 * * * root /srv/statoolinfos/bin/statoolinfos probe -previousday /srv/statoolinfos/conf/foo.bar.org.conf >> /srv/statoolinfos/cron.log
+```
+
+In case of several configuration files, just set the configuration directory (without wildcard):
+```
+1 0,12 * * * root /srv/statoolinfos/bin/statoolinfos probe -previousday /srv/statoolinfos/conf/ >> /srv/statoolinfos/cron.log
 ```
 
 Warning: in previous day mode, the metrics generated are overwrited for the last month, the last week and the last day. So, six weeks in logs are required.
@@ -136,6 +140,7 @@ conf.probe.httpaccesslog.file=/var/log/apache2/foo.bar.org-access.log*
 conf.probe.httpaccesslog.pattern=
 # This parameter requires real ip proxy setting and log output setting.
 conf.probe.etherpad.logs=/var/log/etherpad/output.log
+# Database URL. Example of the most frequent cases:
 # jdbc:mariadb://localhost:1234/databasename
 # jdbc:mysql://localhost:1234/databasename
 # jdbc:postgresql://localhost:1234/databasename
@@ -146,8 +151,6 @@ conf.probe.etherpad.database.password=
 conf.probe.target=/srv/statoolinfos/well-known/statoolinfos/foo.bar.org-metrics.properties
 ```
 
-
-
 ### Framdadate metrics (coming soon)
 
 Configuration template:
@@ -266,6 +269,29 @@ conf.probe.httperrorlog.file=/var/log/apache2/foo.bar.org-error.log*
 conf.probe.target=/srv/statoolinfos/well-known/statoolinfos/foo.bar.org-metrics.properties
 
 # Custom access log pattern with Java regex.
-# Default: "^(?<remoteAddress>[a-zA-F0-9\\\\:\\\\.]+) - (?<remoteUser>[^\\[]+) \\[(?<time>[^\\]]+)\\] \"(?<request>.*)\" (?<status>\\d+) (?<bodyBytesSent>\\d+) \"(?<referer>.*)\" \"(?<userAgent>[^\"]*)\".*$"
+# Default: ^(?<remoteAddress>[a-zA-F0-9\:\.]+) - (?<remoteUser>[^\[]+) \[(?<time>[^\]]+)\] "(?<request>.*)" (?<status>\d+) (?<bodyBytesSent>\d+) "(?<referer>.*)" "(?<userAgent>[^"]*)".*$ 
 conf.probe.httpaccesslog.pattern=
-```
\ No newline at end of file
+
+# Filter request with Java regex.
+# In access log file, request starts with method (GET, PUT, HEAD…).
+# Default: 
+request=^\S+ /.*well-known.*$
+```
+
+Warning: to have month metric values, you have to set **retention log to 7 weeks or 50 days** in Nginx or Apache logrotate configuration.
+
+Pour Nginx, éditer le fichier `/etc/logrotate.d/nginx` :
+```
+/var/log/nginx/*.log {
+        weekly
+        missingok
+        rotate 7
+```
+
+Pour Apache, éditer le fichier `/etc/logrotate.d/apache2` :
+```
+/var/log/apache2/*.log {
+    weekly
+    missingok
+    rotate 7
+```