From 16c81736a5181493b0da9ceef150ac518ef1dacb Mon Sep 17 00:00:00 2001
From: "Jeffrey N. Johnson" <jeff@cohere-llc.com>
Date: Fri, 13 Aug 2021 08:07:51 -0700
Subject: [PATCH] Elaborated on comments for boundary label.

---
 src/tdycore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tdycore.c b/src/tdycore.c
index 22879f69..de1d9176 100644
--- a/src/tdycore.c
+++ b/src/tdycore.c
@@ -378,7 +378,8 @@ PetscErrorCode TDyCreateGrid(TDy tdy) {
     tdy->dm = dm;
   }
 
-  // Mark the grid's boundary faces.
+  // Mark the grid's boundary faces and their transitive closure. All are
+  // stored at their appropriate strata within the label.
   DMLabel boundary_label;
   ierr = DMCreateLabel(tdy->dm, "boundary"); CHKERRQ(ierr);
   ierr = DMGetLabel(tdy->dm, "boundary", &boundary_label); CHKERRQ(ierr);