diff --git a/gwcs/tests/test_coordinate_systems.py b/gwcs/tests/test_coordinate_systems.py
index f977bd03..0d4b3e3a 100644
--- a/gwcs/tests/test_coordinate_systems.py
+++ b/gwcs/tests/test_coordinate_systems.py
@@ -107,7 +107,7 @@ def test_bare_baseframe():
     w = WCS(forward_transform=m.Tabular1D(points=np.arange(10)*u.pix,
                                           lookup_table=np.arange(10)*u.km),
             output_frame=frame,
-            input_frame=cf.CoordinateFrame(1, "PIXEL", (0,), unit=(u.pix,))
+            input_frame=cf.CoordinateFrame(1, "PIXEL", (0,), unit=(u.pix,), name="detector_frame")
             )
     assert u.allclose(w.world_to_pixel(0*u.km), 0)
 
diff --git a/gwcs/wcs.py b/gwcs/wcs.py
index 37328b5b..eff22e7d 100644
--- a/gwcs/wcs.py
+++ b/gwcs/wcs.py
@@ -496,7 +496,6 @@ def unit(self):
     def output_frame(self):
         """Return the output coordinate frame."""
         if self._pipeline:
-            #frame = self._pipeline[-1][0]
             frame = self._pipeline[-1].frame
             if not isinstance(frame, str):
                 frame = frame.name
@@ -508,7 +507,6 @@ def output_frame(self):
     def input_frame(self):
         """Return the input coordinate frame."""
         if self._pipeline:
-            #frame = self._pipeline[0][0]
             frame = self._pipeline[0].frame
             if not isinstance(frame, str):
                 frame = frame.name