diff --git a/client/site_tests/security_DbusOwners/security_DbusOwners.py b/client/site_tests/security_DbusOwners/security_DbusOwners.py
index c588867..064653a 100644
--- a/client/site_tests/security_DbusOwners/security_DbusOwners.py
+++ b/client/site_tests/security_DbusOwners/security_DbusOwners.py
@@ -11,6 +11,8 @@
 from autotest_lib.client.common_lib import error
 
 class security_DbusOwners(test.test):
+    """Enforces a whitelist of known, allowed Dbus interfaces owned by chronos.
+    """
     version = 1
     _DBUS_CONFIG_DIR = '/etc/dbus-1/system.d/'
 
@@ -24,7 +26,7 @@
         return baseline_set
 
 
-    def fetch_owners(self):
+    def fetch_chronos_owned_interfaces(self):
         """
         For every DBus interface XML, look for <policy user="chronos"> sections
         containing <allow own="InterfaceName">. Return the list of interfaces
@@ -33,7 +35,7 @@
         chronos_owned = []
         for root, dirs, files in os.walk(self._DBUS_CONFIG_DIR):
             for filename in files:
-                # Skip cruft like dotfiles
+                # Skip cruft like dotfiles.
                 if not re.search('^[^.].*\.conf$', filename):
                     logging.debug('Skipping %s', filename)
                     continue
@@ -56,9 +58,9 @@
     def run_once(self):
         """
         Enumerate all the DBus interfaces owned by chronos.
-        Fail if it's not included in the expected set.
+        Fail if they're not included in the expected set.
         """
-        observed_set = self.fetch_owners()
+        observed_set = self.fetch_chronos_owned_interfaces()
         baseline_set = self.load_baseline()
 
         # We log but don't fail if we find missing interfaces.