diff --git a/test/_configs/esm-project/marp.config.js b/test/_configs/esm-project/marp.config.js
index 38540d0a..05d990fb 100644
--- a/test/_configs/esm-project/marp.config.js
+++ b/test/_configs/esm-project/marp.config.js
@@ -3,4 +3,4 @@ const config = {}
 
 export default config
 
-console.debug('A config file with .mjs extension was loaded.')
+console.debug('A config file within ESM project was loaded.')