diff --git a/ceilometer/api/controllers/v2.py b/ceilometer/api/controllers/v2.py
index beee8b8af..54325248d 100644
--- a/ceilometer/api/controllers/v2.py
+++ b/ceilometer/api/controllers/v2.py
@@ -1434,7 +1434,7 @@ class AlarmController(rest.RestController):
     def put(self, data):
         """Modify this alarm.
 
-        :param data: a alarm within the request body.
+        :param data: an alarm within the request body.
         """
         # Ensure alarm exists
         alarm_in = self._alarm()
@@ -1508,7 +1508,7 @@ class AlarmController(rest.RestController):
     def put_state(self, state):
         """Set the state of this alarm.
 
-        :param state: a alarm state within the request body.
+        :param state: an alarm state within the request body.
         """
         # note(sileht): body are not validated by wsme
         # Workaround for https://bugs.launchpad.net/wsme/+bug/1227229
@@ -1572,7 +1572,7 @@ class AlarmsController(rest.RestController):
     def post(self, data):
         """Create a new alarm.
 
-        :param data: a alarm within the request body.
+        :param data: an alarm within the request body.
         """
         conn = pecan.request.storage_conn
         now = timeutils.utcnow()
diff --git a/ceilometer/storage/impl_log.py b/ceilometer/storage/impl_log.py
index 5d03405c4..7a36b9165 100644
--- a/ceilometer/storage/impl_log.py
+++ b/ceilometer/storage/impl_log.py
@@ -176,4 +176,4 @@ class Connection(base.Connection):
         return alarm
 
     def delete_alarm(self, alarm_id):
-        """Delete a alarm."""
+        """Delete an alarm."""
diff --git a/ceilometer/storage/impl_mongodb.py b/ceilometer/storage/impl_mongodb.py
index 7ca143838..6c8314f11 100644
--- a/ceilometer/storage/impl_mongodb.py
+++ b/ceilometer/storage/impl_mongodb.py
@@ -922,7 +922,7 @@ class Connection(base.Connection):
     create_alarm = update_alarm
 
     def delete_alarm(self, alarm_id):
-        """Delete a alarm
+        """Delete an alarm
         """
         self.db.alarm.remove({'alarm_id': alarm_id})
 
diff --git a/ceilometer/storage/impl_sqlalchemy.py b/ceilometer/storage/impl_sqlalchemy.py
index 24e48112b..e406c8313 100644
--- a/ceilometer/storage/impl_sqlalchemy.py
+++ b/ceilometer/storage/impl_sqlalchemy.py
@@ -720,7 +720,7 @@ class Connection(base.Connection):
         return self._row_to_alarm_model(alarm_row)
 
     def delete_alarm(self, alarm_id):
-        """Delete a alarm
+        """Delete an alarm
 
         :param alarm_id: ID of the alarm to delete
         """
diff --git a/ceilometer/tests/api/v2/test_alarm_scenarios.py b/ceilometer/tests/api/v2/test_alarm_scenarios.py
index eec679fa8..d05d6be95 100644
--- a/ceilometer/tests/api/v2/test_alarm_scenarios.py
+++ b/ceilometer/tests/api/v2/test_alarm_scenarios.py
@@ -689,7 +689,7 @@ class TestAlarms(FunctionalTest,
 
     def test_post_combination_alarm_as_user_with_unauthorized_alarm(self):
         """Test that post a combination alarm as normal user/project
-        with a alarm_id unauthorized for this project/user
+        with an alarm_id unauthorized for this project/user
         """
         json = {
             'enabled': False,
@@ -716,7 +716,7 @@ class TestAlarms(FunctionalTest,
 
     def test_post_combination_alarm_as_admin_on_behalf_of_an_other_user(self):
         """Test that post a combination alarm as admin on behalf of an other
-        user/project with a alarm_id unauthorized for this project/user
+        user/project with an alarm_id unauthorized for this project/user
         """
         json = {
             'enabled': False,
@@ -753,7 +753,7 @@ class TestAlarms(FunctionalTest,
 
     def _do_post_combination_alarm_as_admin_success(self, owner_is_set):
         """Test that post a combination alarm as admin on behalf of nobody
-        with a alarm_id of someone else, with owner set or not
+        with an alarm_id of someone else, with owner set or not
         """
         json = {
             'enabled': False,