diff --git a/nameparser/_pipeline/_pieces.py b/nameparser/_pipeline/_pieces.py
index e231cabb..a653fa66 100644
--- a/nameparser/_pipeline/_pieces.py
+++ b/nameparser/_pipeline/_pieces.py
@@ -765,8 +765,9 @@ def segment_suffix_reading(pieces: Sequence[Sequence[int]],
     two name words -- and each reads as a suffix whatever its writing
     or company.
 
-    rules/S2's initial veto keeps a roman numeral out of a suffix
-    reading, which is right after a NAME word: 'Smith, John V.' is a
+    The initial veto (`_vocab.is_initial`) keeps a roman numeral out
+    of a suffix reading, which is right after a NAME word (rules/C1's
+    one-character suffix word, read by what stands before it): 'Smith, John V.' is a
     middle initial (#432). After a SUFFIX word the numeral is
     describing that suffix -- 'PSM I' is Professional Scrum Master
     level I -- so the run continues through it, period included, an
diff --git a/tests/v2/cases.py b/tests/v2/cases.py
index d26bc1db..a7bef8b2 100644
--- a/tests/v2/cases.py
+++ b/tests/v2/cases.py
@@ -2697,7 +2697,8 @@ def _check_cjk_shape_purity(self) -> None:
          classification="fix(#289)",
          ambiguities=("suffix-or-name",),
          notes="the two-word twin of 'Royce, Ed' below, and the case "
-               "row item 5 of decisions/S4 turns on -- no corpus "
+               "row decisions/S4's 2026-09-15 entry (THE COUNT "
+               "REACHES THE LISTED SET TOO) turns on -- no corpus "
                "name has this shape, so this row carries the whole "
                "weight of that decision",
          shape=3),
@@ -4265,8 +4266,8 @@ def _check_cjk_shape_purity(self) -> None:
          notes="why the condition asks assign's TRAILING-RUN walk "
                "rather than the suffix-piece test: a bare 'V' is "
                "suffix vocabulary written like an initial, so "
-               "is_suffix_piece refuses it (rules/S2's initial "
-               "veto) and a class test spelled with that predicate "
+               "is_suffix_piece refuses it (the initial veto, "
+               "_vocab.is_initial) and a class test spelled with that predicate "
                "alone would let the link swallow it. The peel takes "
                "it, so trailing_start puts it outside the name's own "
                "words and the link stays the generation -- carrying "
diff --git a/tests/v2/pipeline/test_group.py b/tests/v2/pipeline/test_group.py
index f4734f57..ce353215 100644
--- a/tests/v2/pipeline/test_group.py
+++ b/tests/v2/pipeline/test_group.py
@@ -1438,8 +1438,8 @@ def test_the_right_hand_test_reads_the_peel_not_the_suffix_piece(
 ) -> None:
     # the arm that forces trailing_start rather than is_suffix_piece:
     # a ONE-CHARACTER suffix word is initial-shaped, so the
-    # suffix-piece test refuses it (rules/S2's initial veto) while
-    # assign's trailing peel takes it. Spelled with the piece test
+    # suffix-piece test refuses it (the initial veto,
+    # `_vocab.is_initial`) while assign's trailing peel takes it. Spelled with the piece test
     # alone, the link would swallow the generation here.
     lex = _LINK_LEX.add(suffix_words={"v"})
     out = _grouped("Josep Lluis Carod i V", lexicon=lex)
diff --git a/tests/v2/test_policy.py b/tests/v2/test_policy.py
index f2cda8f1..7b632776 100644
--- a/tests/v2/test_policy.py
+++ b/tests/v2/test_policy.py
@@ -886,7 +886,8 @@ def test_unlisted_caps_suffixes_on_reads_an_all_caps_word() -> None:
     assert default.parse("John Smith XYZ").ambiguities == ()
     # the boundaries: one case, one letter, a digit, and vocabulary.
     # 'John Smith X' is NOT the single-letter control -- 'X' is a bare
-    # roman numeral (rules/S2's numeral fork) and reads as suffix
+    # roman numeral (the trailing numeral fork,
+    # `_vocab.is_trailing_numeral_suffix`) and reads as suffix
     # 'X' with the switch either way, unrelated to this one; 'Z' is
     # not vocabulary at all and stays unaffected by the switch, which
     # is the actual boundary (a single capital never satisfies the