diff --git a/lib/xmet/geo.py b/lib/xmet/geo.py
index 45fea3f..50c0509 100644
--- a/lib/xmet/geo.py
+++ b/lib/xmet/geo.py
@@ -57,7 +57,7 @@ class PointSequence(list):
 
         return indices[0][0]
 
-def line_heading(p1: shapely.Point, p2: shapely.Point) -> float:
+def heading(p1: shapely.Point, p2: shapely.Point) -> float:
     dx = p2.x - p1.x
     dy = p2.y - p1.y