Enable Auto-Complete in Notepad++

I have been using Notepad++ ever since I started working but I have no idea it has an auto-complete feature just like other IDE's. *silly me*

So here's how to enable it:

1. Go to Settings.
2. Click on Preferences.
3. Go to Backup/Auto-Completion.
4. Check Enable auto-completion on each input.

That's it.