diff --git a/htdocs/contrat/class/contrat.class.php b/htdocs/contrat/class/contrat.class.php
index 5265f7025c5..fac549515fc 100644
--- a/htdocs/contrat/class/contrat.class.php
+++ b/htdocs/contrat/class/contrat.class.php
@@ -59,11 +59,11 @@ class Contrat extends CommonObject
 	var $product;
 
 	var $user_author;
-	var $date_creation;
-	var $date_validation;
+	var $date_creation;		// date of creation
+	var $date_validation;	// date of last update
 
-	var $date_contrat;
-	var $date_cloture;
+	var $date_contrat;  // date when contract was signed
+	var $date_cloture;	// deprecated (we close contract lines, not a contract)
 
 	var $commercial_signature_id;
 	var $commercial_suivi_id;