diff --git a/packages/playground/define/vite.config.js b/packages/playground/define/vite.config.js
index 15b5055146ad5d..af2c9b9782b9ce 100644
--- a/packages/playground/define/vite.config.js
+++ b/packages/playground/define/vite.config.js
@@ -5,7 +5,7 @@ module.exports = {
   replacementExclude: ['**.md'],
   plugins: [
     Vue({
-      include: [/\.vue$/, /\.md$/] // <--
+      include: [/\.vue$/, /\.md$/]
     }),
     Markdown()
   ],
diff --git a/packages/vite/src/node/plugins/define.ts b/packages/vite/src/node/plugins/define.ts
index e3c980cc08da84..2f560fbfa1b20c 100644
--- a/packages/vite/src/node/plugins/define.ts
+++ b/packages/vite/src/node/plugins/define.ts
@@ -88,7 +88,7 @@ export function definePlugin(config: ResolvedConfig): Plugin {
       }
 
       if (
-        // exclude css \ static assets \ specified file for performance
+        // exclude css | static assets | specified file for performance
         isCSSRequest(id) ||
         config.assetsInclude(id) ||
         config.replacementExclude(id)