Certain types of products require a comments field to allow customers to specify a particular request alongside their order. For example, you might want customers to specify a gift message for their order, or guidance with the artwork that they're uploading to be printed on one of your products.
By adding a text field to products in Drupal Commerce, you can allow your customers to add their own thoughts or comments to your order.
Follow these steps to add a new comments field to your product uploads:
Navigate to Store settings | Line item types:
Now select the product type to which you want to add the new text field. This example uses the Product (Machine name: product) type, which is created with the default installation of Drupal Commerce. You may want to create a new product type to accommodate this type of product in your store alongside more basic...