diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f7eb6a67263..a8233a3d29f 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -125,6 +125,7 @@ abstract class CommonObject
 
 	/**
 	 * @var boolean		is linkedObjects full loaded. Loaded by ->fetchObjectLinked
+	 * important for pdf generation time reduction
 	 */
 	public $linkedObjectsFullLoaded = false;