Added more detailed explanation about the output of the test

diff --git a/tests/dofs/dof_tools_12a.cc b/tests/dofs/dof_tools_12a.cc
index 93f779b3aa567750462801ec5c91f082e4a3c380..39be28d6a935bc86b3b2f8a21ead74cedab494c9 100644 (file)
--- a/tests/dofs/dof_tools_12a.cc
+++ b/tests/dofs/dof_tools_12a.cc
@@ -39,7 +39,11 @@
 #include "../tests.h"
 
 // check
-//   DoFTools::extract_dofs as in dof_tools_12 in parallel for fewer elements
+//  DoFTools::extract_dofs as in dof_tools_12 in parallel for fewer elements
+// The output of this file is for every process the (boolean) vector of
+// extracted locally owned DoFs (corresponding to local DoF indices), not the
+// extracted vector of the global DoF, which has to be mapped with the locally
+// owned IndexSet first.
 
 void
 output_bool_vector(std::vector<bool> &v)