Update doc

README.md

 
 ## Templating
 
-Each e-mail sent by the form follows a template described in `template.pug` (it's [Pug](pugjs.org/)). If you want to change the way the e-mails you receive are displayed in your mailbox, just edit it! You don't even need to restart the server aftewards :smile:
+Each e-mail sent by the form follows a template described in `template.example.pug` (it's [Pug](pugjs.org/)). If you want to change the way the e-mails you receive are displayed in your mailbox, just edit it! You don't even need to restart the server aftewards :smile:
 
 The template also features custom fields, iterating over the `custom` object, containing the field's label and user-input value:
 
 }
 ```
 
+The template needs to be named `template.pug`. If no template could be found under this name, SMAM will use a default one, which features both default and custom fields, and should be sufficient for non-advanced usage.
+
 ## Personnalising
 
 As you might have already seen, the contact form is generated without any form of style except your browser's default one. But that doesn't meen that you have to add an ugly form to your site to receive contact e-mails, as every element has a specific id (beginning with the `form_` prefix), allowing you to use your own style on your contact form.