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Update README.md

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@@ -109,7 +109,7 @@ $mail->addTo('john@somewhere.com')->
### Using Sections ###
-Sections can be used to further customize messages for the end users.
+Sections can be used to further customize messages for the end users. A section is only useful in conjunction with a substition value.
```php
$mail = new SendGrid\Mail();

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