Thread: customize admin notification email

customize admin notification email

I found the includes/email.php file.
Looking at it I see
$message = html( 'p', sprintf( __( 'New user registration on your site %s:', APP_TD ), $blogname ) ) . PHP_EOL;
$message .= html( 'p', sprintf( __( 'Username: %s', APP_TD ), $user_login ) ) . PHP_EOL;
$message .= html( 'p', sprintf( __( 'E-mail: %s', APP_TD ), $user_email ) ) . PHP_EOL;

What other fields can I add?
I have a few custom fields I would like to add such as contact name and company name.
Thank you.

You will have to change the core file