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diff --git a/src/vector.h b/src/vector.h
index bbc3aa7..4bcb461 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -13,6 +13,9 @@
 // What we'll do here is create the vector type and use typedef to alias Point
 // to it. Yeah, that's it.
 
+class Vector;
+typedef Vector Point;
+
 class Vector
 {
 	public:
@@ -49,13 +52,13 @@ class Vector
 
 		static double Dot(Vector v1, Vector v2);
 		static double Magnitude(Vector v1, Vector v2);
+		static double Angle(Point p1, Point p2);
 		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;
 };
 
-typedef Vector Point;
-
 #endif	// __VECTOR_H__