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diff --git a/include/deal.II/matrix_free/matrix_free.templates.h b/include/deal.II/matrix_free/matrix_free.templates.h
index 04a41b45c94ab36e7d59a577e73776061a8c957d..674a27a9bc08a5949113668bbe705be7eb510b64 100644 (file)
--- a/include/deal.II/matrix_free/matrix_free.templates.h
+++ b/include/deal.II/matrix_free/matrix_free.templates.h
@@ -1795,6 +1795,10 @@ MatrixFree<dim, Number, VectorizedArrayType>::initialize_indices(
                            const bool         ext,
                            const bool         flag) {
                     (void)v;
+                    // The following statement could be simplified
+                    // using AssertIndexRange, but that leads to an
+                    // internal compiler error with GCC 7.4. Do things
+                    // by hand instead.
                     Assert(
                       face_info.faces[f].cells_interior[v] <
                         n_macro_cells_before *