diff --git a/examples/generators/options.py b/examples/generators/options.py
index a15847e32..d11a3d69c 100644
--- a/examples/generators/options.py
+++ b/examples/generators/options.py
@@ -944,8 +944,9 @@ def _mh_extension_build(code: 'Any', kwargs: 'dict[str, Any]') -> 'Any':
     'controls_anonymous': False, 'shit': 0, 'rhit': 0, 'payload': b'',
 }
 
-#: Codes that are HIPv1-only, and the version their constructor demands.
-HIP_VERSION = {129: 2, 128: 1}
+#: Codes tied to one HIP version, and the version their constructor demands:
+#: ``R1_Counter`` (128) and ``HIP_TRANSFORM`` (577) are :rfc:`5201` only.
+HIP_VERSION = {129: 2, 128: 1, 577: 1}
 
 #: How many copies of the parameter under test go in one packet.
 #:
@@ -975,14 +976,14 @@ def _mh_extension_build(code: 'Any', kwargs: 'dict[str, Any]') -> 'Any':
 #: ``Length`` had been counted in 4-octet units where the RFC counts bytes --
 #: which is what moved the one-copy figure from 44 to 46, level with two copies.
 #:
-#: Two remain, neither helped by a second copy since each fails at two copies
+#: Two remained, neither helped by a second copy since each fails at two copies
 #: as well as at one:
 #:
 #: * ``HOST_ID`` declares ``len=8`` and packs 18. Recorded as
 #:   ``hip-parameter/HOST_ID``.
 #: * ``HIP_TRANSFORM`` is HIPv1-only -- ``_read_param_hip_transform`` raises for
-#:   any other version -- while this table builds it at version 2. Recorded as
-#:   ``hip-parameter/HIP_TRANSFORM``.
+#:   any other version -- and is now built at version 1 through
+#:   :data:`HIP_VERSION`, so it round-trips and is no longer recorded.
 #:
 #: A third gap here, ``R1_Counter`` (128), was closed separately by #690 and was
 #: never one of the pair's cancellations above: it parsed as an
@@ -1005,8 +1006,8 @@ def _mh_extension_build(code: 'Any', kwargs: 'dict[str, Any]') -> 'Any':
 #: after #690              47 OK     47 OK
 #: ======================  ========  ==========
 #:
-#: The two gaps above are the only cases either setting fails, and neither
-#: their ``status`` nor their ``defect`` moves between settings, so
+#: ``HOST_ID`` is now the only case either setting fails, and neither its
+#: ``status`` nor its ``defect`` moves between settings, so
 #: :data:`tests.protocols.test_option_roundtrip_unit.EXPECTED_FAILURES` needed no
 #: change to keep recording them accurately at one copy.
 #:
diff --git a/tests/protocols/test_option_roundtrip_unit.py b/tests/protocols/test_option_roundtrip_unit.py
index ad9f6dcc0..98bdd07ca 100644
--- a/tests/protocols/test_option_roundtrip_unit.py
+++ b/tests/protocols/test_option_roundtrip_unit.py
@@ -411,14 +411,9 @@ class Gap(NamedTuple):
     # cycle closes and the entry is deleted rather than kept as documentation of
     # a defect that is no longer there.
 
-    # Two parameters whose own packed length is not what the header arithmetic
-    # can represent, even at HIP_COPIES's old value of two -- see that
-    # constant's note in the generator for the measurement that dropped it to
-    # one without changing either of these.
-    'hip-parameter/HIP_TRANSFORM': Gap(
-        'CONSTRUCT', 'HIPv2: [ParamNo 577] invalid parameter',
-        'pcapkit/protocols/internet/hip.py:698 -- the len check; HIP_TRANSFORM '
-        'packs to a length the make-side arithmetic cannot express'),
+    # A parameter whose own packed length is not what the header arithmetic
+    # can represent, at one copy or two. The generator's HIP_COPIES note
+    # records it as the one HIP case that fails at either setting.
     'hip-parameter/HOST_ID': Gap(
         'CONSTRUCT', 'HIPv2: invalid format',
         'pcapkit/protocols/internet/hip.py:698 -- HOST_ID packs to 14 octets '