diff --git a/code/scripts/main/private/conf/config b/code/scripts/main/private/conf/config
index c936df1..e65b7dd 100644
--- a/code/scripts/main/private/conf/config
+++ b/code/scripts/main/private/conf/config
@@ -8,11 +8,6 @@ key_pub: private/keys/Ragnarok.pub.key
 
 admin_mail: tlams@localhost
 
-[web]
-user: www-data
-
-[api]:
-user: hyperproxmox
 
 [databases]
 ; Databases configurations
diff --git a/doc/md/04-configs.md b/doc/md/04-configs.md
index 7a25a8c..9e56f30 100644
--- a/doc/md/04-configs.md
+++ b/doc/md/04-configs.md
@@ -7,19 +7,24 @@ vi /opt/HyperProxmox/code/scripts/main/private/conf/config
 [system]
 ; System configurations
 user: hyperproxmox
+```
+User created in the "Backend" page.   
+This user will run Hyperproxmox.
 
+``` bash
 ; If not exist at startup, the key will be auto-generate.
 key_pvt: private/keys/Ragnarok.pvt.key
 key_pub: private/keys/Ragnarok.pub.key
+```
+Directory and private/public key generated to protect the critical data in MongoDB.  
+Private key is setup with an passphrase.
 
+``` bash
 admin_mail: tlams@localhost
+```
+Receive alerts and information by mail. Currently not implemented.
 
-[web]
-user: www-data
-
-[api]:
-user: hyperproxmox
-
+``` bash
 [databases]
 ; Databases configurations
 ; NOSQL databases, should use a password
@@ -32,7 +37,13 @@ redis_user:
 redis_password:
 redis_ip: 127.0.0.1
 redis_port: 6379
+```
+Databases setting for backed.  
+User / Password are not currently supported.  
+Don't expose your database on 0.0.0.0 or without firewall.
 
+
+``` bash
 [deploy]
 ; Maximum concurrent deployment
 ; A high value can overcharge your physicals servers
@@ -42,43 +53,81 @@ concurrencydeploy: 2
 ; If your infrastructure isn't very large, you should'nt reduce this delay.
 ; A low delay can overcharge your physicals servers
 delayrounddeploy: 15
+```
+Currently not implemented (machine provision)
 
+
+``` bash
 [walker]
 ; Delay in seconds between to crawl (update)
 walker: 300
+```
+Delay minimum between to crawling on your Proxmox infrastructure.  
+A lock block a new crawl if the precedent is not terminated. If this situation append, the next crawl is
+canceled and reported to the next windows.
+A delay too short can generate massive(and useless) data if your infrastructure is large ! 
+```
 
+``` bash
 ; Lock file -- prevent concurrent crawling
 walker_lock: /tmp/hyperproxmoxwalker.lock
+```
+Lock file. The directory have to be writable by Hyperproxmox user.
 
+``` bash
 ; Set an unique ID (change comment part)
 uid = False
-
+```
+Work but useless in this version.  
+HyperProxmox will set an unique ID in the comment area (machine configuration),
+with in the future the goal to have the possibility to follow an virtual machine in the infrastructure.
+The currents comments are not deleted, just reported after this ID.
+  
+``` bash
 [logger]
 ; logs level    1: "INFO",  2: "WARNING", 3: "ERROR", 4: "CRITICAL",  5: "DEBUG"
 logs_level = 5
+```
+Log level definite the logs verbosity.  
+In production, you should definite this setting on "WARNING".  
+In "DEBUG", hyperproxmox can generate lot of logs.
+This system is currently only implemented on the main functions.
 
+``` bash
 ; Limit IO write, if debug level is active, this value is overwrite to 0
 bulk_write = 1
 
 ; Buffer size
 bulk_size = 1000
+```
+The goal is to limit the I/O usage on your hard drive. 
+HyperProxmox will save the logs in memory and write on the disk only when the buffer(bulk_size) is full.  
 
+
+``` bash
 ; log output
 logs_dir = /var/log/hyperproxmox/
 ```
+Logs directory have to be writable by Hyperproxmox user.
+
 
 #### Purge system
-You should setup an cron to purge old data.
+You should setup an cron to purge old data (not an obligation).  
+This cron allow the possibility to delete automatically old data in your database.  
+
 ``` bash
-RET=4 # older than the current date less this delay in days
+RET=90 # older than the current date less this delay in days
 DATETIMESTAMP=$(($(date +%s)-$((86400*$RET))))
-curl -H -XPOST -d '{ "action": "purge", "type":"strict", "date": $DATETIMESTAMP }'  localhost:8080/api/v1/administration/purge
+0 0 * * * hyperproxmox curl -H -XPOST -d '{ "action": "purge", "type":"strict", "date": $DATETIMESTAMP }'  localhost:8080/api/v1/administration/purge >/var/log/hyperproxmox/purge.log 2>&1
 ```
 * action: actiontype (only purge is currently available)
 * type: purge type (strict = all data before this date)
 * date: delete data before this date - in seconds(timestamp)
 
+Currently, just one mod is available: stric.  
+It's mean that ALL data will be delete before the date. 
+Some others possibility should be available in the future, like keep one day per week.
 
 
 
-[Readme](03-frontend.md) <-- Previous | Next --> [Usage - First start](05-first_start.md)
+[Frontend](03-frontend.md) <-- Previous | Next --> [Usage - First start](05-first_start.md)