Custom email for processing order in Woocommerce

Hi everyone,

I have just read:

Which is a great article, In the last section “WooCommerce Custom Email Per Product” he describes how to change the title of a processing email via the ID of the product, which is great, I would however now need to also change the text underneath the title, the bit that says “Just to let you know - we’ve received…”, I am unsure if I need to add a hook to the code given in the example, or what to d.

Thanks in advance