diff --git a/htdocs/expensereport/class/expensereportstats.class.php b/htdocs/expensereport/class/expensereportstats.class.php
index deaa386da9d..59bcc9841a9 100644
--- a/htdocs/expensereport/class/expensereportstats.class.php
+++ b/htdocs/expensereport/class/expensereportstats.class.php
@@ -60,7 +60,7 @@ class ExpenseReportStats extends Stats
 		$this->field='total_ht';
 
 		$this->where = " e.fk_statut > 0";
-		//$this->where.= " AND e.date_valid > '2000-01-01'";    // To filter only approved
+		$this->where.= " AND e.date_valid > '2000-01-01'";    // To filter only correct "valid date". If date is invalid, the group by on it will fails. Launch a repair.php if you have. 
 		$this->where.= ' AND e.entity IN ('.getEntity('expensereport', 1).')';
 		
 		//$this->where.= " AND entity = ".$conf->entity;