diff --git a/src/python/devtest/os/test/ListCmd.py b/src/python/devtest/os/test/ListCmd.py
index 7fdde9a..a7a674e 100644
--- a/src/python/devtest/os/test/ListCmd.py
+++ b/src/python/devtest/os/test/ListCmd.py
@@ -74,6 +74,14 @@ class ListCmd(TestCase): # export
             decisive = self.parent.decisive
             for field in decisive:
                 s, o = self.field(field, throw=False), other.field(field, throw=False)
+                # if s:
+                #     if not o:
+                #         return 1
+                #     # s and o both not None, checks below are meaningful
+                # else:
+                #     if not o:
+                #        continue # both are equal and None
+                #     return -1 # s is None, o isn't
                 if (s and not o) or (o and not s):
                     if s: # certainly not o
                         return 1