address comments

diff --git a/include/deal.II/grid/manifold.h b/include/deal.II/grid/manifold.h
index b230690e74cd04cb0f0ade79d6b6d38404e9f4b0..0326dea60c61f62021056c75ca4f927d59acf36b 100644 (file)
--- a/include/deal.II/grid/manifold.h
+++ b/include/deal.II/grid/manifold.h
@@ -549,7 +549,9 @@ public:
   /**
    * Return the normal vector to a face embedded in this manifold, at
    * the point p. It is not required that the normals actually point
-   * outward. If p is not in fact on the surface, but only
+   * outward from the domain even if the face iterator given points
+   * to a face on the boundary of the domain.
+   * If p is not in fact on the surface, but only
    * close-by, try to return something reasonable, for example the
    * normal vector at the surface point closest to p.  (The point p
    * will in fact not normally lie on the actual surface, but rather