diff --git a/pandas/tests/indexes/categorical/test_category.py b/pandas/tests/indexes/categorical/test_category.py
index 03a298a13dc2b..4a65d65c03d91 100644
--- a/pandas/tests/indexes/categorical/test_category.py
+++ b/pandas/tests/indexes/categorical/test_category.py
@@ -21,6 +21,9 @@
 class TestCategoricalIndex:
     @pytest.fixture
     def simple_index(self) -> CategoricalIndex:
+        """
+        Fixture that provides a CategoricalIndex.
+        """
         return CategoricalIndex(list("aabbca"), categories=list("cab"), ordered=False)
 
     def test_can_hold_identifiers(self):