diff --git a/htdocs/asset/class/asset.class.php b/htdocs/asset/class/asset.class.php
index 04c195c08ff..64e8551928f 100644
--- a/htdocs/asset/class/asset.class.php
+++ b/htdocs/asset/class/asset.class.php
@@ -128,7 +128,14 @@ class Asset extends CommonObject
 
 	public $note_public;
 	public $note_private;
+	
+	/**
+	 * Creation date
+	 * @var int
+	 */
 	public $date_creation;
+	
+	
 	public $tms;
 
 	/**
diff --git a/htdocs/blockedlog/class/blockedlog.class.php b/htdocs/blockedlog/class/blockedlog.class.php
index 906040a6bd9..cd41bb5837e 100644
--- a/htdocs/blockedlog/class/blockedlog.class.php
+++ b/htdocs/blockedlog/class/blockedlog.class.php
@@ -100,7 +100,13 @@ class BlockedLog
 	 */
 	public $fk_user = 0;
 
+	/**
+	 * Creation date
+	 * @var int
+	 */
 	public $date_creation;
+	
+	
 	public $date_modification;
 
 	public $date_object = 0;
diff --git a/htdocs/bom/class/bom.class.php b/htdocs/bom/class/bom.class.php
index 444caa2a4da..dbaa450463b 100644
--- a/htdocs/bom/class/bom.class.php
+++ b/htdocs/bom/class/bom.class.php
@@ -112,7 +112,14 @@ class BOM extends CommonObject
 	public $description;
 	public $note_public;
 	public $note_private;
+	
+	/**
+	 * Creation date
+	 * @var int
+	 */
 	public $date_creation;
+	
+	
 	public $tms;
 	public $fk_user_creat;
 	public $fk_user_modif;
diff --git a/htdocs/comm/mailing/class/mailing.class.php b/htdocs/comm/mailing/class/mailing.class.php
index 41f74846125..6bd1d17f53a 100644
--- a/htdocs/comm/mailing/class/mailing.class.php
+++ b/htdocs/comm/mailing/class/mailing.class.php
@@ -67,7 +67,13 @@ class Mailing extends CommonObject
 	public $user_creat;
 	public $user_valid;
 
+	/**
+	 * Creation date
+	 * @var int
+	 */
 	public $date_creat;
+	
+	
 	public $date_valid;
 
 	public $extraparams=array();