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When you add new files to a shared folder in Google Drive, the person you're sharing with can be notified in a few ways:

1. **Email Notifications**: If they have email notifications enabled, they'll receive an email alerting them about the new files.
2. **Google Drive Notifications**: They can also receive notifications directly within Google Drive, either on their computer or mobile device.
3. **Activity Stream**: The shared folder's activity stream will show the addition of new files, which they can check manually.

To ensure they get notified, they should check their notification settings in Google Drive. They can do this by going to **Settings > Notifications** and making sure the relevant options are enabled.