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diff --git a/src/vector.h b/src/vector.h
index bbc3aa7..6243898 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -51,6 +51,7 @@ class Vector
 		static double Magnitude(Vector v1, Vector v2);
 		static double Parameter(Vector v1, Vector v2, Vector p);
 		static Vector Normal(Vector v1, Vector v2);
+		static double AngleBetween(Vector a, Vector b);
 
 	public:
 		double x, y, z;