diff --git a/libs/geom/include/psemek/geom/contains.hpp b/libs/geom/include/psemek/geom/contains.hpp
index 8467382d..3da9d280 100644
--- a/libs/geom/include/psemek/geom/contains.hpp
+++ b/libs/geom/include/psemek/geom/contains.hpp
@@ -25,6 +25,21 @@ namespace psemek::geom
 		return true;
 	}
 
+	template <typename T>
+	bool contains(interval<T> const & i1, interval<T> const i2)
+	{
+		return (i1.min <= i2.min) && (i2.max <= i1.max);
+	}
+
+	template <typename T, std::size_t N>
+	bool contains(box<T, N> const & b1, box<T, N> const & b2)
+	{
+		for (std::size_t i = 0; i < N; ++i)
+			if (!contains(b1[i], b2[i]))
+				return false;
+		return true;
+	}
+
 	template <typename T>
 	bool half_open_contains(interval<T> const & i, T const & x)
 	{