diff --git a/pandas/tests/indexing/interval/test_interval_new.py b/pandas/tests/indexing/interval/test_interval_new.py
index 283921a23e368..4c1efe9e4f81d 100644
--- a/pandas/tests/indexing/interval/test_interval_new.py
+++ b/pandas/tests/indexing/interval/test_interval_new.py
@@ -17,6 +17,9 @@
 class TestIntervalIndex:
     @pytest.fixture
     def series_with_interval_index(self):
+        """
+        Fixture providing a Series with an IntervalIndex.
+        """
         return Series(np.arange(5), IntervalIndex.from_breaks(np.arange(6)))
 
     def test_loc_with_interval(self, series_with_interval_index, indexer_sl):