diff --git a/Convex_hull_3/doc_tex/Convex_hull_3_ref/Convex_hull_traits_3.tex b/Convex_hull_3/doc_tex/Convex_hull_3_ref/Convex_hull_traits_3.tex
index 69a73f5df2e..b37a55cd250 100644
--- a/Convex_hull_3/doc_tex/Convex_hull_3_ref/Convex_hull_traits_3.tex
+++ b/Convex_hull_3/doc_tex/Convex_hull_3_ref/Convex_hull_traits_3.tex
@@ -37,7 +37,7 @@ function.
 \ccGlue
 \ccTypedef{typedef R::Triangle_3  Triangle_3;}{}
 \ccGlue
-\ccTypedef{typedef R::Plane_3  Plane_3;}{}
+\ccNestedType{Plane_3;}{A triple of points, in order to avoid the need for exact constructions.}
 \ccGlue
 \ccTypedef{typedef R::Vector_3  Vector_3;}{}
 \ccGlue