diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 620ea8a2ef2..f42aa953ff5 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -3892,6 +3892,7 @@ abstract class CommonObject
 
 		// Important for pdf generation time reduction
 		// This boolean is true if $this->linkedObjects has already been loaded with all objects linked without filter
+		// If you need to force the reload, you can call clearObjectLinkedCache() before calling fetchObjectLinked()
 		if ($this->id > 0 && !empty($this->linkedObjectsFullLoaded[$this->id])) {
 			return 1;
 		}