How to add/update custom cart item data in the cart page

I want to add a comment to individual products in the cart page. I am new to woocommerce so I have no idea how to do.

I have done some research. In that tutorial,
I found that I can use woocommerce_add_cart_item_data hook this way:

add_filter( 'woocommerce_add_cart_item_data', 'add_comment', 10, 3 );

function add_comment( $cart_item_data, $product_id, $variation_id ) {

    $cart_item_data['comment'] = 'This is comment';

    return $cart_item_data;

}

but this is not work in my case.

Thank you.

• This topic was modified 4 years, 8 months ago by ravigreencubes.