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diff --git a/src/vector.cpp b/src/vector.cpp
index e9ad51f..58228ca 100644
--- a/src/vector.cpp
+++ b/src/vector.cpp
@@ -133,6 +133,24 @@ Vector& Vector::operator+=(double const v)
 	return *this;
 }
 
+// Vector - vector, self assigned
+
+Vector& Vector::operator-=(Vector const v)
+{
+	x -= v.x, y -= v.y, z -= v.z;
+
+	return *this;
+}
+
+// Vector - constant, self assigned
+
+Vector& Vector::operator-=(double const v)
+{
+	x -= v, y -= v, z -= v;
+
+	return *this;
+}
+
 
 Vector Vector::Unit(void)
 {