diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 69f24be3a..b73bdc357 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -1396,6 +1396,7 @@ EOF
 				$sListenerRank = (float)($oListener->GetChildText('rank', '0'));
 				$sEvents .= <<<PHP
 
+		// listenerId = $sListenerId
 		Combodo\iTop\Service\Events\EventService::RegisterListener("$sEventName", $sEventListener, \$this->m_sObjectUniqId, [], null, $sListenerRank, '$sModuleRelativeDir');
 PHP;
 			}