diff --git a/doc/source/whatsnew/v2.2.0.rst b/doc/source/whatsnew/v2.2.0.rst
index ea6539f93de86..7743f762d8898 100644
--- a/doc/source/whatsnew/v2.2.0.rst
+++ b/doc/source/whatsnew/v2.2.0.rst
@@ -296,7 +296,7 @@ Datetimelike
 
 Timedelta
 ^^^^^^^^^
-- Bug in rendering (``__repr__``) of :class:`TimedeltaIndex` and :class:`Series` with timedelta64 values with non-nanosecond resolution entries that are all multiples of 24 hours failing to use the compact representation used in the nanosecond cases (:issue:`??`)
+- Bug in rendering (``__repr__``) of :class:`TimedeltaIndex` and :class:`Series` with timedelta64 values with non-nanosecond resolution entries that are all multiples of 24 hours failing to use the compact representation used in the nanosecond cases (:issue:`55405`)
 -
 
 Timezones
diff --git a/pandas/tests/indexes/timedeltas/test_formats.py b/pandas/tests/indexes/timedeltas/test_formats.py
index fb652a7dbc14b..ee090bd0aaf0a 100644
--- a/pandas/tests/indexes/timedeltas/test_formats.py
+++ b/pandas/tests/indexes/timedeltas/test_formats.py
@@ -9,6 +9,7 @@
 
 class TestTimedeltaIndexRendering:
     def test_repr_round_days_non_nano(self):
+        # GH#55405
         # we should get "1 days", not "1 days 00:00:00" with non-nano
         tdi = TimedeltaIndex(["1 days"], freq="D").as_unit("s")
         result = repr(tdi)