Cart Page Alter Main Content

The cart page reads "Total Cost" but although taxes are included, shipping charges have not yet been added. This should read "Total Cost Before Shipping" or shipping charges should be included. I have only 1 shipping charge if the order is less than $30.00. (using modern-responsive theme)

How can I alter this page?

Thank you

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If you go to checkout, select shipping method and back to cart page, you will see total cost including shipping cost

Since I don't offer a choice of delivery methods, I don't use the select shipping method feature. So I suppose I have to use a note to explain that the cart total does not include shipping. Not the best solution.

Thanks anyway