diff --git a/preload.php b/preload.php
index 9d16bb31554f..288b30b4ef48 100644
--- a/preload.php
+++ b/preload.php
@@ -101,7 +101,9 @@ public function load(): void
                 }
 
                 require_once $file[0];
-                echo 'Loaded: ' . $file[0] . "\n";
+                // Uncomment only for debugging (to inspect which files are included).
+                // Never use this in production - preload scripts must not generate output.
+                // echo 'Loaded: ' . $file[0] . "\n";
             }
         }
     }