diff --git a/htdocs/multicurrency/class/multicurrency.class.php b/htdocs/multicurrency/class/multicurrency.class.php
index 57a6c1ee69a..f2ff645052c 100644
--- a/htdocs/multicurrency/class/multicurrency.class.php
+++ b/htdocs/multicurrency/class/multicurrency.class.php
@@ -90,7 +90,7 @@ class MultiCurrency extends CommonObject
 	public $fk_user;
 
 	/**
-	 * @var CurrencyRate 	The currency rate
+	 * @var CurrencyRate|null 	The currency rate
 	 */
 	public $rate;