diff --git a/python/pacemaker/_cts/tests/stoponebyone.py b/python/pacemaker/_cts/tests/stoponebyone.py
index 02ebe60055..16bd46bad1 100644
--- a/python/pacemaker/_cts/tests/stoponebyone.py
+++ b/python/pacemaker/_cts/tests/stoponebyone.py
@@ -1,41 +1,48 @@
-""" Test-specific classes for Pacemaker's Cluster Test Suite (CTS)
-"""
+""" Stop all running nodes serially """
 
 __all__ = ["StopOnebyOne"]
 __copyright__ = "Copyright 2000-2023 the Pacemaker project contributors"
 __license__ = "GNU General Public License version 2 or later (GPLv2+) WITHOUT ANY WARRANTY"
 
 from pacemaker._cts.tests.ctstest import CTSTest
 from pacemaker._cts.tests.simulstartlite import SimulStartLite
 from pacemaker._cts.tests.stoptest import StopTest
 
 
 class StopOnebyOne(CTSTest):
-    '''Stop all the nodes in order'''
+    """ A concrete test that stops all running nodes serially """
+
     def __init__(self, cm):
-        CTSTest.__init__(self,cm)
+        """ Create a new StartOnebyOne instance
+
+            Arguments:
+
+            cm -- A ClusterManager instance
+        """
+
+        CTSTest.__init__(self, cm)
+
         self.name = "StopOnebyOne"
+
         self._startall = SimulStartLite(cm)
         self._stop = StopTest(cm)
 
     def __call__(self, dummy):
-        '''Perform the 'StopOnebyOne' test. '''
-        self.incr("calls")
+        """ Perform this test """
 
-        #     We ignore the "node" parameter...
+        self.incr("calls")
 
-        #     Start up all the nodes...
         ret = self._startall(None)
         if not ret:
             return self.failure("Setup failed")
 
         failed = []
         self.set_timer()
         for node in self._env["nodes"]:
             if not self._stop(node):
                 failed.append(node)
 
         if len(failed) > 0:
             return self.failure("Some node failed to stop: " + repr(failed))
 
         return self.success()