diff --git a/playground/optimize-deps/vite.config.js b/playground/optimize-deps/vite.config.js
index d78d0098c5b09f..adc68bf9e9253e 100644
--- a/playground/optimize-deps/vite.config.js
+++ b/playground/optimize-deps/vite.config.js
@@ -1,6 +1,7 @@
 const fs = require('fs')
 const vue = require('@vitejs/plugin-vue')
 
+// Prevent vitest from setting process.env.NODE_ENV
 process.env.NODE_ENV = ''
 
 /**