diff --git a/armi/nuclearDataIO/cccc/nhflux.py b/armi/nuclearDataIO/cccc/nhflux.py
index c4a210d8f..f8efbeff5 100644
--- a/armi/nuclearDataIO/cccc/nhflux.py
+++ b/armi/nuclearDataIO/cccc/nhflux.py
@@ -253,8 +253,9 @@ def readWrite(self):
         # Read the hex ordering map between DIF3D nodal and DIF3D GEODST. Also read index
         # pointers to incoming partial currents on outer reactor surface (these don't
         # belong to any assembly). Incoming partial currents are non-zero due to flux
-        # extrapolation. This record is only required when nSurf is greater than 1 (it
-        # is equal to one for VARSRC files, which are a subset of NHFLUX files).
+        # extrapolation. This record is only required when nSurf is greater than 1. It
+        # is equal to 1 for VARSRC files, which are a subset of NHFLUX files; VARSRC files
+        # do not have a 2D record (or 4D or 5D records).
         if self._metadata["nSurf"] > 1:
             self._rwGeodstCoordMap2D()
 
diff --git a/armi/nuclearDataIO/cccc/tests/test_nhflux.py b/armi/nuclearDataIO/cccc/tests/test_nhflux.py
index 94e8eecab..d791c33fb 100644
--- a/armi/nuclearDataIO/cccc/tests/test_nhflux.py
+++ b/armi/nuclearDataIO/cccc/tests/test_nhflux.py
@@ -222,8 +222,8 @@ def setUpClass(cls):
 
     def test_writeRead(self):
         """
-        Write out the data structure to file. Then read it back in and make sure it matches
-        the data currently in memory.
+        Write out the modified data structure to file. Then, we read it back in and make
+        sure it matches the data currently in memory.
         """
         filename = "VARSRC"
         with TemporaryDirectoryChanger():