How to change the names of "topics" in Moodle 2

In Moodle 2, you can change the name of "topics" (or sections), so that the actual names show in the navigation, rather than Topic 1, Topic 2, etc.
To do this, turn editing on and click on the settings gear under the topic name (it says "Edit Summary" when you hover over it).  Deselect the box that says "use default section name."  Enter the name you want and save.