diff --git a/evolibs/Form.php b/evolibs/Form.php
index 74aea53..611caf6 100644
--- a/evolibs/Form.php
+++ b/evolibs/Form.php
@@ -257,11 +257,17 @@ class FormPage {
 class FormField {
     protected $value = null;
     protected $error = null;
+    /** @var string|null $label */
     protected $label = null;
+    /** @var string|null $name */
     protected $name = null;
+    /** @var string|null $css_class */
     protected $css_class = null;
+    /** @var bool|null $read_only */
     protected $read_only = null;
+    /** @var bool|null $disabled True if the field is supposed to be disabled */
     protected $disabled = null;
+    /** @var array|null $storage */
     private $storage = NULL;
 
     protected function __construct($label) {
diff --git a/inc/accounts.php b/inc/accounts.php
index 95980ab..080ec18 100644
--- a/inc/accounts.php
+++ b/inc/accounts.php
@@ -31,6 +31,12 @@ else {
     $cache = $conf['cache'];
 }
 
+/**
+ * Create a new domain (local only)
+ * @param FormPage $form
+ * @param string $admin_mail
+ * @return array
+ */
 function web_add($form, $admin_mail) {
     global $conf;
 
@@ -84,6 +90,12 @@ function web_add($form, $admin_mail) {
     return array($exec_cmd, $exec_return, $exec_output);
 }
 
+/**
+ * Create a new domain (cluster only)
+ * @param FormPage $form
+ * @param string $admin_mail
+ * @return array
+ */
 function web_add_cluster($form, $admin_mail) {
     global $cache;
     global $conf;
diff --git a/inc/common.php b/inc/common.php
index 129ae90..8bb1ece 100644
--- a/inc/common.php
+++ b/inc/common.php
@@ -16,6 +16,12 @@
 /**
  * Functions
  */
+
+ /**
+  * Check if a file exists and is readable and `die()` if it doesnt.
+  * @param string $file
+  * @return void
+  */
 function test_exist($file) {
     if(!file_exists($file)) {
         die("Erreur, vous devez mettre en place le fichier $file !\n");
@@ -25,11 +31,20 @@ function test_exist($file) {
     }   
 }
 
+/**
+ * Redirect the page to $path on the same HOST
+ * @param string $path
+ * @return never
+ */
 function http_redirect($path) {
     header('Location: '.$_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['HTTP_HOST'].$path);
     exit(0);
 }
 
+/**
+ * @param string $filename
+ * @return string
+ */
 function findexts ($filename)
 {
     $filename = strtolower($filename) ;
@@ -39,15 +54,26 @@ function findexts ($filename)
     return $exts;
 } 
 
+/**
+ * Check if the user is a superadmin
+ * @return bool
+ */
 function is_superadmin() {
     global $conf;
     if(!empty($_SESSION['user']) && in_array($_SESSION['user'], $conf['superadmin'])) {
-        return 1;
+        return true;
     } else {
-        return 0;
+        return false;
     }
 }
 
+/**
+ * Execute a command with sudo
+ * @param string $cmd The command that will be executed.
+ * @param array $output output of the command.
+ * @param int $return_var return status of the command.
+ * @return void
+ */
 function sudoexec($cmd, &$output, &$return_var) {
     global $conf;
 
@@ -60,7 +86,8 @@ function sudoexec($cmd, &$output, &$return_var) {
 }
 
 /**
- * Return TRUE is Evoadmin is installed in cluster mode.
+ * Check if Evoadmin is installed in cluster mode
+ * @return boolean
  */
 function is_cluster_mode() {
     global $conf;
@@ -68,7 +95,8 @@ function is_cluster_mode() {
 }
 
 /**
- * Return TRUE is Evoadmin is installed in multi-cluster mode.
+ * Check if Evoadmin is installed in multi-cluster mode.
+ * @return boolean
  */
 function is_mcluster_mode() {
     global $conf;
@@ -77,6 +105,8 @@ function is_mcluster_mode() {
 
 /**
  * Load config file for the specified cluster.
+ * @param string $cluster
+ * @return void
  */
 function load_config_cluster($cluster) {
     global $conf;
@@ -87,8 +117,7 @@ function load_config_cluster($cluster) {
 }
 
 /**
- * Return wether or not this evoadmin install is a multi PHP install
- *
+ * Check if evoadmin install is a multi PHP install
  * @return boolean - True when it's a multi PHP system
  */
 function is_multiphp() {
@@ -97,9 +126,9 @@ function is_multiphp() {
 }
 
 /**
- *  Webadd
- *
- * @return boolean - True when it's a multi PHP system
+ * Webadd
+ * @param string $command webadd command to run
+ * @return array output from the command
  */
 function run_webadd_cmd($command) {
     global $conf;
@@ -127,6 +156,11 @@ if (!(ini_set('include_path', ini_get('include_path')))) {
     require_once 'PEAR.php';
     require_once 'Log.php';
 
+    /**
+     * (simply there to silence a warning)
+     * @var array $oriconf
+     * @var array $localconf
+     */
     // config files
     // (here because need Log PEAR lib)
     test_exist('../conf/connect.php');
diff --git a/inc/ftpadmin.php b/inc/ftpadmin.php
index 98d8884..983dc00 100644
--- a/inc/ftpadmin.php
+++ b/inc/ftpadmin.php
@@ -229,6 +229,12 @@ if ($action=="add") {
 $_SESSION['error']=null;
 $_SESSION['form']=null;
 
+/**
+ * Format Byte representation in human readable format (power of 1024)
+ * @param float|int $bytes
+ * @param int|null $precision
+ * @return string Human formatted amount of bytes
+ */
 function formatBytes($bytes, $precision = 2) {
     $bytes *= 1024;
     $units = array('o', 'Ko', 'Mo', 'Go', 'To');
@@ -242,7 +248,9 @@ function formatBytes($bytes, $precision = 2) {
     return round($bytes, $precision) . ' ' . $units[$pow];
 } 
 
-
+/**
+ * @return string[]
+ */
 function get_owner_list() {
     $owner_list = array();
     
diff --git a/lib/bdd.php b/lib/bdd.php
index 6784650..1129a78 100644
--- a/lib/bdd.php
+++ b/lib/bdd.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * @desc mini class to manipulate sqlite db for evocluster.
+ * mini class to manipulate sqlite db for evocluster.
  *
  * @example
  * <?php
@@ -43,7 +43,7 @@ class bdd {
     private $db; /* resource of a created database */
 
     /**
-     * @desc Open a sqlite database in rw mode. Create it if it doesn't exist.
+     * Open a sqlite database in rw mode. Create it if it doesn't exist.
      * @param string $db_name Name of the sqlite database
      */  
     public function open($db_name)
@@ -58,9 +58,9 @@ class bdd {
     }
 
     /**
-     * @desc Close the current database instance
+     * Close the current database instance
      *
-     * Note: php close automatically the instance on exit
+     * Note: php automatically close the instance on exit
      */
     public function close()
     {
@@ -68,7 +68,7 @@ class bdd {
     }
 
     /**
-     * @desc Install the table structure on a new sqlite database
+     * Install the table structure on a new sqlite database
      * @param string $dn_name Name of the sqlite database
      */
     public function create($db_name)
@@ -136,7 +136,7 @@ class bdd {
    }
 
     /**
-     * @desc Get the account id of an account_name
+     * Get the account id of an account_name
      * @param string $account_name Name of the account
      * @return int 0 if account_name doesn't exist,
      *             id else
@@ -159,8 +159,8 @@ class bdd {
     }
 
     /**
-     * @desc Get account 
-     * @param account name
+     * Get account 
+     * @param string $account_name account name
      * @return array
      */
     public function get_account($account_name)
@@ -183,7 +183,7 @@ class bdd {
     }
 
     /** 
-     * @desc Check if account_name entry exists on table Accounts
+     * Check if account_name entry exists on table Accounts
      * @param string $account_name Name of the account
      * @return int 1 if it exists,
      *             0 else
@@ -194,7 +194,7 @@ class bdd {
     }
 
     /**
-     * @desc Add an account to the table Accounts
+     * Add an account to the table Accounts
      * @param array { 
      *          'name' => "$name",
      *          'domain' => "$domain",
@@ -236,7 +236,7 @@ class bdd {
 
 
     /**
-     * @desc Add an alias to the table Serveralias
+     * Add an alias to the table Serveralias
      * @param array { 
      *          'domain' => "$domain",
      *          'alias' => "$alias",
@@ -264,7 +264,7 @@ class bdd {
     }
     
     /**
-     * @desc Del an alias from the table Serveralias
+     * Delete an alias from the table Serveralias
      * @param array { 
      *          'domain' => "$domain",
      *          'alias' => "$alias",
@@ -289,7 +289,7 @@ class bdd {
     }
 
     /**
-     * @desc Get the server id of a server_name
+     * Get the server id of a server_name
      * @param string $server_name Name of the server
      * @return int 0 if server_name doesn't exist,
      *             id else
@@ -312,7 +312,7 @@ class bdd {
     }
 
     /** 
-     * @desc Check if server_name entry exists on table Servers
+     * Check if server_name entry exists on table Servers
      * @param string $server_name Name of the server
      * @return int 1 if it exists,
      *             0 else
@@ -324,7 +324,7 @@ class bdd {
 
 
     /**
-     * @desc Add an server to the table Servers
+     * Add an server to the table Servers
      * @param array { 
      *          'name' => "$name",
      *        }
@@ -353,7 +353,7 @@ class bdd {
     }
 
     /**
-     * @desc Add a role to the table Roles
+     * Add a role to the table Roles
      * @param string $account_name
      *        string $server_name
      *        string $role master or slave
@@ -397,7 +397,7 @@ class bdd {
 
 
     /**
-     * @desc List domains by server's role
+     * List domains by server's role
      * @param none
      * @return list of array 
      *      example : Array (
diff --git a/lib/domain.php b/lib/domain.php
index 1e6dea7..5c189f3 100644
--- a/lib/domain.php
+++ b/lib/domain.php
@@ -1,5 +1,13 @@
 <?php
 
+/**
+ * Add a domain in BIND
+ * @param string $name Domain to add
+ * @param string $IP IP of web server for this domain
+ * @param bool $with_mxs Set to `true` if you wants to add MX records. Otherwise set to `false`.
+ * @param bool $gmail Set to `true` if the Google MXs are to be used by this domain as its MXs.
+ * @return array
+ */
 function domain_add($name, $IP, $with_mxs, $gmail=false) {
 
     $exec_cmd = 'bind-add-ng.sh';
diff --git a/lib/letsencrypt.php b/lib/letsencrypt.php
index 8c0d2d4..b581657 100644
--- a/lib/letsencrypt.php
+++ b/lib/letsencrypt.php
@@ -10,7 +10,8 @@ class LetsEncrypt
     const HTTP_CHALLENGE_URL = '/.well-known/acme-challenge/testfile';
 
     /**
-     * create the file used to test the HTTP challenge
+     * Create the file used to test the HTTP challenge
+     * @return void
      */
     private function createFileHttpChallenge()
     {
@@ -19,7 +20,8 @@ class LetsEncrypt
     }
 
     /**
-     * delete the file used to test the HTTP challenge
+     * Delete the file used to test the HTTP challenge
+     * @return void
      */
     private function deleteFileHttpChallenge()
     {
@@ -28,9 +30,9 @@ class LetsEncrypt
     }
 
     /**
-     * generate a CSR
+     * Generate a CSR
      * @param  string $vhost
-     * @param  Array $domains
+     * @param  string[] $domains
      * @return boolean
      */
     public function makeCsr($vhost, $domains)
@@ -69,7 +71,7 @@ class LetsEncrypt
     /**
      * perform a cURL call on the remote resource
      * the cURL call follows redirections
-     * @param  Array  $domains list of domains
+     * @param  array  $domains list of domains
      * @return boolean
      */
     public function checkRemoteResourceAvailability($domain)
@@ -108,8 +110,8 @@ class LetsEncrypt
 
     /**
      * Query the corresponding IP for each domain
-     * @param  Array $domains list of HTTP checked domains
-     * @return Array $valid_dns_domains list of valid domains
+     * @param  string[] $domains list of HTTP checked domains
+     * @return array $valid_dns_domains list of valid domains
      */
     public function checkDNSValidity($domains)
     {
@@ -133,7 +135,7 @@ class LetsEncrypt
     }
 
     /**
-     * check the presence of make-csr and evoacme binaries
+     * Check the presence of make-csr and evoacme binaries
      * @return boolean
      */
     public function isEvoacmeInstalled()
@@ -151,7 +153,7 @@ class LetsEncrypt
     /**
      * Retrieve the SSL certificate from the URL
      * @param  string $domain
-     * @return Array|false $cont list of parameters of the certificate, or false
+     * @return array|false $cont list of parameters of the certificate, or false
      */
     public function getCertificate($domain)
     {
@@ -164,8 +166,8 @@ class LetsEncrypt
 
     /**
      * Parse the certificat arguments and extract data
-     * @param  Array $certificateParameters certificat arguments
-     * @return Array $infosCert contains only the issuer, domains and expiration date
+     * @param  array $certificateParameters certificat arguments
+     * @return array $infosCert contains only the issuer, domains and expiration date
      */
     public function parseCertificate($certificateParameters)
     {
@@ -204,6 +206,12 @@ class LetsEncrypt
         return ($timestampCertValidUntil > $currentDate) ? true : false;
     }
 
+    /**
+     * Check if the requested domain is included in the certificate
+     * @param string $domainRequested
+     * @param string[]|string $san
+     * @return bool
+     */
     public function isDomainIncludedInCert($domainRequested, $san)
     {
         $san = preg_replace('/DNS:| DNS:/', '', $san);