merge_triangulations(): formulate documentation in a way that keeping the manifolds...

diff --git a/include/deal.II/grid/grid_generator.h b/include/deal.II/grid/grid_generator.h
index 3171127d8a6a1ecab0f7c50b59a39e093de5ae6e..68ed8c33d03cf3aa206abcd3a642d898ce861f40 100644 (file)
--- a/include/deal.II/grid/grid_generator.h
+++ b/include/deal.II/grid/grid_generator.h
@@ -1531,8 +1531,9 @@ namespace GridGenerator
    * default boundary indicators, then you will have to set boundary indicators
    * again by hand in the output triangulation.
    *
-   * @note Unlike most GridGenerator functions, this function does not attach
-   * any manifolds to @p result, nor does it set any manifold ids.
+   * @note This function does not attach any manifolds to @p result, nor does
+   * it set any manifold ids. In particular, manifolds attached to the two
+   * input triangulations will be lost in the @p result triangulation.
    *
    * @note For a related operation on refined meshes when both meshes are
    * derived from the same coarse mesh, see