diff --git a/libs/geom/include/psemek/geom/simplex.hpp b/libs/geom/include/psemek/geom/simplex.hpp
index 503fef57..8716c95b 100644
--- a/libs/geom/include/psemek/geom/simplex.hpp
+++ b/libs/geom/include/psemek/geom/simplex.hpp
@@ -30,6 +30,30 @@ namespace psemek::geom
 	template <typename ... Args>
 	simplex(Args ...) -> simplex<std::common_type_t<Args...>, sizeof...(Args) - 1>;
 
+	template <typename Point, std::size_t K>
+	auto begin(simplex<Point, K> & s)
+	{
+		return std::begin(s.points);
+	}
+
+	template <typename Point, std::size_t K>
+	auto begin(simplex<Point, K> const & s)
+	{
+		return std::begin(s.points);
+	}
+
+	template <typename Point, std::size_t K>
+	auto end(simplex<Point, K> & s)
+	{
+		return std::end(s.points);
+	}
+
+	template <typename Point, std::size_t K>
+	auto end(simplex<Point, K> const & s)
+	{
+		return std::end(s.points);
+	}
+
 	template <typename Point>
 	using segment = simplex<Point, 1>;