diff --git a/htdocs/accountancy/class/bookkeeping.class.php b/htdocs/accountancy/class/bookkeeping.class.php
index b4e747d65f3..3a9319da46b 100644
--- a/htdocs/accountancy/class/bookkeeping.class.php
+++ b/htdocs/accountancy/class/bookkeeping.class.php
@@ -1975,7 +1975,13 @@ class BookKeepingLine
 	public $code_journal;
 	public $journal_label;
 	public $piece_num;
+	
+	/**
+	 * Creation date
+	 * @var int
+	 */
 	public $date_creation;
+	
     public $date_modification;
     public $date_export;
 }