diff --git a/openstackclient/tests/compute/v2/test_flavor.py b/openstackclient/tests/compute/v2/test_flavor.py
index 3a59020c49..9ae2696255 100644
--- a/openstackclient/tests/compute/v2/test_flavor.py
+++ b/openstackclient/tests/compute/v2/test_flavor.py
@@ -126,7 +126,9 @@ class TestFlavorList(TestFlavor):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
@@ -153,7 +155,9 @@ class TestFlavorList(TestFlavor):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
@@ -180,7 +184,9 @@ class TestFlavorList(TestFlavor):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
@@ -207,7 +213,9 @@ class TestFlavorList(TestFlavor):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
@@ -234,7 +242,9 @@ class TestFlavorList(TestFlavor):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
diff --git a/openstackclient/tests/compute/v2/test_security_group.py b/openstackclient/tests/compute/v2/test_security_group.py
index 87cc4870d8..63ced7358d 100644
--- a/openstackclient/tests/compute/v2/test_security_group.py
+++ b/openstackclient/tests/compute/v2/test_security_group.py
@@ -158,7 +158,9 @@ class TestSecurityGroupList(TestSecurityGroup):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         # Set expected values
diff --git a/openstackclient/tests/compute/v2/test_security_group_rule.py b/openstackclient/tests/compute/v2/test_security_group_rule.py
index a2f9b10825..fc75bde93b 100644
--- a/openstackclient/tests/compute/v2/test_security_group_rule.py
+++ b/openstackclient/tests/compute/v2/test_security_group_rule.py
@@ -404,7 +404,9 @@ class TestSecurityGroupRuleList(TestSecurityGroupRule):
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         collist = (
@@ -440,7 +442,9 @@ class TestSecurityGroupRuleList(TestSecurityGroupRule):
 
         parsed_args = self.check_parser(self.cmd, [], [])
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         columns, data = self.cmd.take_action(parsed_args)
 
         collist = (
diff --git a/openstackclient/tests/compute/v2/test_service.py b/openstackclient/tests/compute/v2/test_service.py
index c9c45c1fa4..71700aa836 100644
--- a/openstackclient/tests/compute/v2/test_service.py
+++ b/openstackclient/tests/compute/v2/test_service.py
@@ -81,7 +81,9 @@ class TestServiceList(TestService):
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
 
-        # DisplayCommandBase.take_action() returns two tuples
+        # In base command class Lister in cliff, abstractmethod take_action()
+        # returns a tuple containing the column names and an iterable
+        # containing the data to be listed.
         self.cmd.take_action(parsed_args)
 
         self.service_mock.list.assert_called_with(