Added note on mesh refinement to GridGenerator::extrude_triangulation

Fixes #1887

diff --git a/include/deal.II/grid/grid_generator.h b/include/deal.II/grid/grid_generator.h
index cfd62ec40963a1b0847c5d13f949c95543a35186..dd254ff4d1e16f4130d0b7aeebe6e7e150a1a381 100644 (file)
--- a/include/deal.II/grid/grid_generator.h
+++ b/include/deal.II/grid/grid_generator.h
@@ -870,6 +870,9 @@ namespace GridGenerator
    * boundary indicators of the faces of @p input are going to be assigned to
    * the corresponding side walls in z direction. The bottom and top get the
    * next two free boundary indicators.
+   *
+   * @note The 2d input triangulation @p input must be a coarse mesh that
+   * has no refined cells.
    */
   void
   extrude_triangulation (const Triangulation<2, 2> &input,