Zen Cart 1.3.8a

How do I change the text below the Shipping Method: in step 1 of 3 in the Delivery Information page. I'm using a flat rate. I have free shipping over a certain amount and want to include this in the text below the Shipping Method.

I only edited the text. I did not change anything else.

I changed this text in checkout_shipping.php

define('TEXT_ENTER_SHIPPING_INFORMATION', 'This is currently the only shipping method available to use on this order.');

I changed it to

define('TEXT_ENTER_SHIPPING_INFORMATION', 'This is currently the only shipping method available to use on this order. Free Shipping on Orders over $100.00');

The next page comes up blank. I changed it back and everything is ok then.


I changed nothing else!

What do I need to do to change the text below Shipping Description:?