diff --git a/glanceclient/tests/unit/v2/test_shell_v2.py b/glanceclient/tests/unit/v2/test_shell_v2.py
index 8dcfc569..e91045de 100644
--- a/glanceclient/tests/unit/v2/test_shell_v2.py
+++ b/glanceclient/tests/unit/v2/test_shell_v2.py
@@ -3142,7 +3142,8 @@ class ShellV2Test(testtools.TestCase):
     def test_do_md_tag_create_multiple(self):
         args = self._make_args({'namespace': 'MyNamespace',
                                 'delim': ',',
-                                'names': 'MyTag1, MyTag2'})
+                                'names': 'MyTag1, MyTag2',
+                                'append': False})
         with mock.patch.object(
                 self.gc.metadefs_tag, 'create_multiple') as mocked_create_tags:
             expect_tags = [{'tags': [{'name': 'MyTag1'}, {'name': 'MyTag2'}]}]
@@ -3152,7 +3153,28 @@ class ShellV2Test(testtools.TestCase):
             test_shell.do_md_tag_create_multiple(self.gc, args)
 
             mocked_create_tags.assert_called_once_with(
-                'MyNamespace', tags=['MyTag1', 'MyTag2'])
+                'MyNamespace', tags=['MyTag1', 'MyTag2'], append=False)
+            utils.print_list.assert_called_once_with(
+                expect_tags,
+                ['name'],
+                field_settings={
+                    'description': {'align': 'l', 'max_width': 50}})
+
+    def test_do_md_tag_create_multiple_with_append(self):
+        args = self._make_args({'namespace': 'MyNamespace',
+                                'delim': ',',
+                                'names': 'MyTag1, MyTag2',
+                                'append': True})
+        with mock.patch.object(
+                self.gc.metadefs_tag, 'create_multiple') as mocked_create_tags:
+            expect_tags = [{'tags': [{'name': 'MyTag1'}, {'name': 'MyTag2'}]}]
+
+            mocked_create_tags.return_value = expect_tags
+
+            test_shell.do_md_tag_create_multiple(self.gc, args)
+
+            mocked_create_tags.assert_called_once_with(
+                'MyNamespace', tags=['MyTag1', 'MyTag2'], append=True)
             utils.print_list.assert_called_once_with(
                 expect_tags,
                 ['name'],
diff --git a/glanceclient/v2/metadefs.py b/glanceclient/v2/metadefs.py
index 1b641ac7..a98a9fec 100644
--- a/glanceclient/v2/metadefs.py
+++ b/glanceclient/v2/metadefs.py
@@ -490,9 +490,8 @@ class TagController(object):
         """Create the list of tags.
 
         :param namespace: Name of a namespace to which the Tags belong.
-        :param kwargs: list of tags.
+        :param kwargs: list of tags, optional parameter append.
         """
-
         tag_names = kwargs.pop('tags', [])
         md_tag_list = []
 
@@ -502,11 +501,15 @@ class TagController(object):
             except (warlock.InvalidOperation) as e:
                 raise TypeError(encodeutils.exception_to_unicode(e))
         tags = {'tags': md_tag_list}
+        headers = {}
 
         url = '/v2/metadefs/namespaces/%(namespace)s/tags' % {
-            'namespace': namespace}
+              'namespace': namespace}
 
-        resp, body = self.http_client.post(url, data=tags)
+        append = kwargs.pop('append', False)
+        if append:
+            headers['X-Openstack-Append'] = True
+        resp, body = self.http_client.post(url, headers=headers, data=tags)
         body.pop('self', None)
         for tag in body['tags']:
             yield self.model(tag), resp
diff --git a/glanceclient/v2/shell.py b/glanceclient/v2/shell.py
index d936ca57..05fc4640 100644
--- a/glanceclient/v2/shell.py
+++ b/glanceclient/v2/shell.py
@@ -1396,10 +1396,12 @@ def do_md_tag_create(gc, args):
 @utils.arg('--delim', metavar='<DELIM>', required=False,
            help=_('The delimiter used to separate the names'
                   ' (if none is provided then the default is a comma).'))
+@utils.arg('--append', default=False, action='store_true', required=False,
+           help=_('Append the new tags to the existing ones instead of'
+                  'overwriting them'))
 def do_md_tag_create_multiple(gc, args):
     """Create new metadata definitions tags inside a namespace."""
     delim = args.delim or ','
-
     tags = []
     names_list = args.names.split(delim)
     for name in names_list:
@@ -1411,7 +1413,7 @@ def do_md_tag_create_multiple(gc, args):
         utils.exit('Please supply at least one tag name. For example: '
                    '--names Tag1')
 
-    fields = {'tags': tags}
+    fields = {'tags': tags, 'append': args.append}
     new_tags = gc.metadefs_tag.create_multiple(args.namespace, **fields)
     columns = ['name']
     column_settings = {