Adding content to the Bank Transfer plugin

I want to customise the page that a customer is directed to if they choose the Bank Transfer as a payment option once they complete checkout.
I have already added my bank details to this page. But I also want to add some extra information after this, thanking the customer for the order, telling them what happens now etc. How do I do this?

I didnt want to put it in the bank account information window. As its a lot of content, and then would end with an unchangeable message about using a deposit reference when making the transfer. So it would not read correctly.

Thanks I got around it by adding a link to an article containing the information I wanted to give to the purchaser.

Thanks for the ongoing assistance Nicolas. Yours customer service is amazing.

Hello,

I tried to edit the module banktransfer in order to change the text when the customer confirm his order.
When I open the banktransfer_end.php (/plugins/hikashoppayment/banktransfer) I see the following:

defined('_JEXEC') or die('Restricted access');

?><div class="hikashop_banktransfer_end" id="hikashop_banktransfer_end">

	<span class="hikashop_banktransfer_end_message" id="hikashop_banktransfer_end_message">

		<?php echo JText::_('ORDER_IS_COMPLETE').'<br/>'.

		JText::sprintf('PLEASE_TRANSFERT_MONEY',$this->amount).'<br/>'.

		$this->information.'<br/>'.

		JText::sprintf('INCLUDE_ORDER_NUMBER_TO_TRANSFER',$this->order_number).'<br/>'.

		JText::_('THANK_YOU_FOR_PURCHASE');?>

	</span>

</div>

Thanks a lot!