diff --git a/openstackclient/tests/image/v1/test_image.py b/openstackclient/tests/image/v1/test_image.py
index 7044ea1da4..201105a409 100644
--- a/openstackclient/tests/image/v1/test_image.py
+++ b/openstackclient/tests/image/v1/test_image.py
@@ -73,7 +73,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # ImageManager.create(name=, **)
@@ -120,7 +122,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # ImageManager.create(name=, **)
@@ -172,7 +176,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Ensure input file is opened
@@ -676,7 +682,9 @@ class TestImageShow(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
         self.images_mock.get.assert_called_with(
             image_fakes.image_id,
diff --git a/openstackclient/tests/image/v2/test_image.py b/openstackclient/tests/image/v2/test_image.py
index 3c478b53d3..de37512f07 100644
--- a/openstackclient/tests/image/v2/test_image.py
+++ b/openstackclient/tests/image/v2/test_image.py
@@ -95,7 +95,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # ImageManager.create(name=, **)
@@ -156,7 +158,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # ImageManager.create(name=, **)
@@ -288,7 +292,9 @@ class TestImageCreate(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # ImageManager.create(name=, **)
@@ -382,7 +388,9 @@ class TestAddProjectToImage(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
         self.image_members_mock.create.assert_called_with(
             image_fakes.image_id,
@@ -404,7 +412,9 @@ class TestAddProjectToImage(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
         self.image_members_mock.create.assert_called_with(
             image_fakes.image_id,
@@ -1156,7 +1166,9 @@ class TestImageShow(TestImage):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
         self.images_mock.get.assert_called_with(
             image_fakes.image_id,
diff --git a/openstackclient/tests/object/v1/test_container.py b/openstackclient/tests/object/v1/test_container.py
index 62dc4f737b..5b0fb48a34 100644
--- a/openstackclient/tests/object/v1/test_container.py
+++ b/openstackclient/tests/object/v1/test_container.py
@@ -382,7 +382,9 @@ class TestContainerShow(TestContainer):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
diff --git a/openstackclient/tests/object/v1/test_container_all.py b/openstackclient/tests/object/v1/test_container_all.py
index c2dd02a59a..95e12f47f3 100644
--- a/openstackclient/tests/object/v1/test_container_all.py
+++ b/openstackclient/tests/object/v1/test_container_all.py
@@ -57,7 +57,9 @@ class TestContainerCreate(TestContainerAll):
         )]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.assertEqual(self.columns, columns)
@@ -91,7 +93,9 @@ class TestContainerCreate(TestContainerAll):
         )]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.assertEqual(self.columns, columns)
@@ -312,7 +316,9 @@ class TestContainerShow(TestContainerAll):
         )]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         collist = (
diff --git a/openstackclient/tests/object/v1/test_object.py b/openstackclient/tests/object/v1/test_object.py
index 431ab472ef..990e4f46fa 100644
--- a/openstackclient/tests/object/v1/test_object.py
+++ b/openstackclient/tests/object/v1/test_object.py
@@ -354,7 +354,9 @@ class TestObjectShow(TestObject):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
diff --git a/openstackclient/tests/object/v1/test_object_all.py b/openstackclient/tests/object/v1/test_object_all.py
index f36d2ea73b..89286b00e4 100644
--- a/openstackclient/tests/object/v1/test_object_all.py
+++ b/openstackclient/tests/object/v1/test_object_all.py
@@ -152,7 +152,9 @@ class TestObjectShow(TestObjectAll):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         collist = (
diff --git a/openstackclient/tests/volume/v1/test_volume.py b/openstackclient/tests/volume/v1/test_volume.py
index be9356e6d4..00c509b5d9 100644
--- a/openstackclient/tests/volume/v1/test_volume.py
+++ b/openstackclient/tests/volume/v1/test_volume.py
@@ -95,7 +95,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -136,7 +138,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -189,7 +193,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -242,7 +248,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -281,7 +289,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -325,7 +335,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
@@ -369,7 +381,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         # VolumeManager.create(size, snapshot_id=, source_volid=,
diff --git a/openstackclient/tests/volume/v2/test_volume.py b/openstackclient/tests/volume/v2/test_volume.py
index 76c7a27a39..df43cb2b2a 100644
--- a/openstackclient/tests/volume/v2/test_volume.py
+++ b/openstackclient/tests/volume/v2/test_volume.py
@@ -96,7 +96,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -133,7 +135,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -181,7 +185,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -229,7 +235,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -263,7 +271,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -302,7 +312,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(
@@ -341,7 +353,9 @@ class TestVolumeCreate(TestVolume):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class ShowOne in cliff, abstract method take_action()
+        # returns a two-part tuple with a tuple of column names and a tuple of
+        # data to be shown.
         columns, data = self.cmd.take_action(parsed_args)
 
         self.volumes_mock.create.assert_called_with(