Mileage and shelter information is updated annually from trail volunteers. On the Tennessee-North Carolina line, 1.5 miles were added, and 0.2 miles were added on the North Carolina-Georgia line.

The bulk of the mileage increase came from southwest Virginia, where remeasurement added two miles. The final increases came from central Virginia and the New York-New Jersey line, which each saw increases of 0.1 mile. 

The Appalachian Trail Data Book and the Appalachian Trail Thru-Hikers’ Companion document all mileage changes.