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diff --git a/src/vector.h b/src/vector.h
index 67d9aa9..c3d6a4d 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -53,6 +53,7 @@ class Vector
 
 		static double Dot(Vector v1, Vector v2);
 		static double Magnitude(Vector v1, Vector v2);
+		static Vector Unit(Point p1, Point p2);
 		static double Angle(Point p1, Point p2);
 		static double Parameter(Vector v1, Vector v2, Vector p);
 		static Vector Normal(Vector v1, Vector v2);