From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 20 Aug 2024 14:42:11 +0000 (-0600)
Subject: Leave a comment in the documentation.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a600902a6bed03472df9c592ddd78b74db3abed7;p=dealii.git

Leave a comment in the documentation.
---

diff --git a/include/deal.II/dofs/dof_tools.h b/include/deal.II/dofs/dof_tools.h
index 39442f70b7..08081a8353 100644
--- a/include/deal.II/dofs/dof_tools.h
+++ b/include/deal.II/dofs/dof_tools.h
@@ -1159,7 +1159,10 @@ namespace DoFTools
    *   are to be filtered by this function.
    * @param[in] component_mask A mask that states which components you want
    *   to select. The size of this mask must be compatible with the number of
-   *   components in the FiniteElement used by the @p dof_handler. See
+   *   components in the FiniteElement used by the @p dof_handler. A common
+   *   way to create this kind of mask is using extractors for whatever
+   *   vector component you want to extract, and using it with
+   *   FiniteElement::component_mask(). See
    *   @ref GlossComponentMask "the glossary entry on component masks"
    *   for more information.
    * @return An IndexSet object that will contain exactly those entries that