diff --git a/htdocs/debugbar/class/DataCollector/DolQueryCollector.php b/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
index 8430cf41adf..03811890f43 100644
--- a/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
+++ b/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
@@ -24,6 +24,7 @@ class DolQueryCollector extends DataCollector implements Renderable, AssetProvid
 	{
 		global $db;
 
+		// Replace $db handler with new handler override by TraceableDB
 		$db = new TraceableDB($db);
 
 		$this->db = $db;
diff --git a/htdocs/debugbar/class/TraceableDB.php b/htdocs/debugbar/class/TraceableDB.php
index 0caf6c2489f..4d34da61465 100644
--- a/htdocs/debugbar/class/TraceableDB.php
+++ b/htdocs/debugbar/class/TraceableDB.php
@@ -7,7 +7,6 @@ require_once DOL_DOCUMENT_ROOT .'/core/db/DoliDB.class.php';
  *
  * Used to log queries into DebugBar
  */
-
 class TraceableDB extends DoliDB
 {
 	/**