diff --git a/docs/api/app.md b/docs/api/app.md
index 745b0c431881..ec6a0da536cd 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -351,7 +351,7 @@ line argument to the new instance:
 ```javascript
 const {app} = require('electron')
 
-app.relaunch({args: process.argv.slice(1) + ['--relaunch']})
+app.relaunch({args: process.argv.slice(1).concat(['--relaunch'])})
 app.exit(0)
 ```