Changing the default page template for the category view in Magento

I’ve been handed a layout to build for a Magento project which uses a 1-column layout for the catalog category view. Out-of-the-box Magento uses the 3-column layout. To change the default behaviour I added the following to my app/design/frontend/custom/default/layout/local.xml

<?xml version="1.0"?>
        <reference name="root">
            <action method="setTemplate"><template>page/1column.phtml</template></action>

I’m still getting used to how Magento handles it’s layouts using xml but the more I work with it, the more it makes sense.