diff --git a/libs/geom/include/psemek/geom/simplex.hpp b/libs/geom/include/psemek/geom/simplex.hpp
index 072b0f07..503fef57 100644
--- a/libs/geom/include/psemek/geom/simplex.hpp
+++ b/libs/geom/include/psemek/geom/simplex.hpp
@@ -72,6 +72,30 @@ namespace psemek::geom
 		return !(s1 < s2);
 	}
 
+	template <typename T, std::size_t N, std::size_t K>
+	simplex<point<T, N>, K> operator + (simplex<point<T, N>, K> s, geom::vector<T, N> const & v)
+	{
+		for (auto & p : s.points)
+			p += v;
+		return s;
+	}
+
+	template <typename T, std::size_t N, std::size_t K>
+	simplex<point<T, N>, K> operator + (geom::vector<T, N> const & v, simplex<point<T, N>, K> s)
+	{
+		for (auto & p : s.points)
+			p += v;
+		return s;
+	}
+
+	template <typename T, std::size_t N, std::size_t K>
+	simplex<point<T, N>, K> operator - (simplex<point<T, N>, K> s, geom::vector<T, N> const & v)
+	{
+		for (auto & p : s.points)
+			p -= v;
+		return s;
+	}
+
 	template <typename Point, std::size_t K>
 	std::ostream & operator << (std::ostream & os, simplex<Point, K> const & s)
 	{