From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Mon, 12 Jul 2021 18:55:35 +0000 (-0600)
Subject: Update documentation in SubcellData.
X-Git-Tag: v9.4.0-rc1~1150^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12567%2Fhead;p=dealii.git

Update documentation in SubcellData.
---

diff --git a/include/deal.II/grid/tria_description.h b/include/deal.II/grid/tria_description.h
index 02644277ed..e7c9d4c3f0 100644
--- a/include/deal.II/grid/tria_description.h
+++ b/include/deal.II/grid/tria_description.h
@@ -213,7 +213,11 @@ struct SubCellData
 
   /**
    * A vector of CellData<2> objects that describe boundary and manifold
-   * information for quads of 3d triangulations.
+   * information for triangles and quads of 3d triangulations. The name of
+   * the variable is historical and dates back to a time when deal.II only
+   * supported hexahedral meshes in 3d, where then all boundary faces were
+   * necessarily quadrilaterals. However, the variable is now also used to
+   * describe boundary triangles for tetrahedral and mixed meshes.
    *
    * This vector may not be used in the creation of 1d or 2d triangulations.
    */