@@ -534,6 +534,7 @@ def foo(x, y):
         # Ensure that is really a new overload for the lifted loop
         self.assertEqual(len(lifted.signatures), 2)
 
+    # Repeated sin/cos in this loop lets NumPy<1.25 error grow past ULP tolerance.
     @unittest.skipIf(numpy_sincos_low_precision,
                      "NumPy<1.25 sincos vs libm")
     def test_lift_objectmode_issue_4223(self):
 
@@ -5732,6 +5732,7 @@ def test_select_exception(self):
                 np_nbfunc(condlist, choicelist, default)
             self.assertIn(expected_text, str(e.exception))
 
+    # Near-zero window endpoints differ in sign under NumPy<1.25 sincos.
     @unittest.skipIf(numpy_sincos_low_precision,
                      "NumPy<1.25 sincos vs libm")
     def test_windowing(self):