diff --git a/Documentation/ProjectFile/gml/surfaces/surface/element/i_element.md b/Documentation/ProjectFile/gml/surfaces/surface/element/i_element.md
index e9552bc218788ced6fad05d0761c712194b9bbc3..3c5185e045fb04a5133de10678f7dc8543bba658 100644
--- a/Documentation/ProjectFile/gml/surfaces/surface/element/i_element.md
+++ b/Documentation/ProjectFile/gml/surfaces/surface/element/i_element.md
@@ -1,3 +1,4 @@
 Defines a triangle by its three points.
-The face normal of the triangle is determined such that the points are
-located counter-clockwise around it (right-hand rule).
+
+\ogs_missing_documentation
+\todo How is the face normal of a triangle determined?