From 0eaf0a87b7c8f74c2a444ff3926613eb65a3771a Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 23 Feb 2022 21:30:37 -0700
Subject: [PATCH] Minor updates to ARKode in-code commentary.

---
 source/sundials/arkode.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/sundials/arkode.cc b/source/sundials/arkode.cc
index 5118490a36..c68e57abd7 100644
--- a/source/sundials/arkode.cc
+++ b/source/sundials/arkode.cc
@@ -448,6 +448,8 @@ namespace SUNDIALS
     while (!time.is_at_end())
       {
         time.set_desired_next_step_size(data.output_period);
+
+        // Let ARKode advance time by one period:
         double actual_next_time;
 #  if DEAL_II_SUNDIALS_VERSION_LT(4, 0, 0)
         const auto status = SundialsARKode(arkode_mem,
@@ -465,9 +467,12 @@ namespace SUNDIALS
         (void)status;
         AssertARKode(status);
 
+        // Then reflect this time advancement in our own DiscreteTime object:
         time.set_next_step_size(actual_next_time - time.get_current_time());
         time.advance_time();
 
+        // Finally check whether resets or output calls are desired at this
+        // time:
         while (solver_should_restart(time.get_current_time(), solution))
           reset(time.get_current_time(),
                 time.get_previous_step_size(),
-- 
2.39.5