small documentation fix

diff --git a/include/deal.II/grid/grid_generator.h b/include/deal.II/grid/grid_generator.h
index 2842fbd1c90030f54937d6e48974c38b3ee9bd7b..d2844c92734a924ece67cea53de060c88482ee04 100644 (file)
--- a/include/deal.II/grid/grid_generator.h
+++ b/include/deal.II/grid/grid_generator.h
@@ -1857,8 +1857,8 @@ namespace GridGenerator
      *       can of course be extruded into the third dimension using
      *       GridGenerator::extrude().
      *
-     * @param[in] tria The triangulation to be created. It needs to be empty
-     *                 upon calling this function.
+     * @param[out] tria The triangulation to be created. It needs to be empty
+     *             upon calling this function.
      * @param[in] additional_data Configuration of the mesh.
      *
      \htmlonly <style>div.image