diff --git a/src/content/configuration/output.mdx b/src/content/configuration/output.mdx
index 7ea47391c78a..5f1dfa94f82f 100644
--- a/src/content/configuration/output.mdx
+++ b/src/content/configuration/output.mdx
@@ -582,6 +582,7 @@ module.exports = {
   },
 };
 ```
+W> we can't run the funtion before getting the filename because we pass pathData to this function.
 
 Make sure to read the [Caching guide](/guides/caching) for details. There are more steps involved than only setting this option.