diff --git a/README.rst b/README.rst
index ed4dc96b5..6207d89f0 100644
--- a/README.rst
+++ b/README.rst
@@ -160,6 +160,7 @@ You'll find complete documentation on the shell by running
                             Add a source group rule to a security group.
         secgroup-add-rule   Add a rule to a security group.
         secgroup-create     Create a security group.
+        secgroup-update     Update a security group.
         secgroup-delete     Delete a security group.
         secgroup-delete-group-rule
                             Delete a source group rule from a security group.
diff --git a/novaclient/tests/v1_1/fakes.py b/novaclient/tests/v1_1/fakes.py
index 127bb7ec0..8f9047bc0 100644
--- a/novaclient/tests/v1_1/fakes.py
+++ b/novaclient/tests/v1_1/fakes.py
@@ -1160,6 +1160,12 @@ class FakeHTTPClient(base_client.HTTPClient):
                 self.get_os_security_groups()[2]['security_groups'][0]}
         return (202, {}, r)
 
+    def put_os_security_groups_1(self, body, **kw):
+        assert body.keys() == ['security_group']
+        fakes.assert_has_keys(body['security_group'],
+                              required=['name', 'description'])
+        return (205, {}, body)
+
     #
     # Security Group Rules
     #
diff --git a/novaclient/tests/v1_1/test_security_groups.py b/novaclient/tests/v1_1/test_security_groups.py
index ce8e66337..9f3ae46bb 100644
--- a/novaclient/tests/v1_1/test_security_groups.py
+++ b/novaclient/tests/v1_1/test_security_groups.py
@@ -45,6 +45,12 @@ class SecurityGroupsTest(utils.TestCase):
         cs.assert_called('POST', '/os-security-groups')
         self.assertTrue(isinstance(sg, security_groups.SecurityGroup))
 
+    def test_update_security_group(self):
+        sg = cs.security_groups.list()[0]
+        secgroup = cs.security_groups.update(sg, "update", "update")
+        cs.assert_called('PUT', '/os-security-groups/1')
+        self.assertTrue(isinstance(secgroup, security_groups.SecurityGroup))
+
     def test_refresh_security_group(self):
         sg = cs.security_groups.get(1)
         sg2 = cs.security_groups.get(1)
diff --git a/novaclient/tests/v1_1/test_shell.py b/novaclient/tests/v1_1/test_shell.py
index 8defd288d..c3c509687 100644
--- a/novaclient/tests/v1_1/test_shell.py
+++ b/novaclient/tests/v1_1/test_shell.py
@@ -1287,6 +1287,13 @@ class ShellTest(utils.TestCase):
                                {'name': 'test',
                                 'description': 'FAKE_SECURITY_GROUP'}})
 
+    def test_security_group_update(self):
+        self.run_command('secgroup-update test te FAKE_SECURITY_GROUP')
+        self.assert_called('PUT', '/os-security-groups/1',
+                           {'security_group':
+                               {'name': 'te',
+                                'description': 'FAKE_SECURITY_GROUP'}})
+
     def test_security_group_list(self):
         self.run_command('secgroup-list')
         self.assert_called('GET', '/os-security-groups')
diff --git a/novaclient/v1_1/security_groups.py b/novaclient/v1_1/security_groups.py
index 551811526..d0778634a 100644
--- a/novaclient/v1_1/security_groups.py
+++ b/novaclient/v1_1/security_groups.py
@@ -29,6 +29,9 @@ class SecurityGroup(base.Resource):
     def delete(self):
         self.manager.delete(self)
 
+    def update(self):
+        self.manager.update(self)
+
 
 class SecurityGroupManager(base.ManagerWithFind):
     resource_class = SecurityGroup
@@ -44,6 +47,19 @@ class SecurityGroupManager(base.ManagerWithFind):
         body = {"security_group": {"name": name, 'description': description}}
         return self._create('/os-security-groups', body, 'security_group')
 
+    def update(self, group, name, description):
+        """
+        Update a security group
+
+        :param group: The security group to delete (group or ID)
+        :param name: name for the security group to update
+        :param description: description for the security group to update
+        :rtype: the security group object
+        """
+        body = {"security_group": {"name": name, 'description': description}}
+        return self._update('/os-security-groups/%s' % base.getid(group),
+                            body, 'security_group')
+
     def delete(self, group):
         """
         Delete a security group
diff --git a/novaclient/v1_1/shell.py b/novaclient/v1_1/shell.py
index 21e658959..cbf2d9fdc 100644
--- a/novaclient/v1_1/shell.py
+++ b/novaclient/v1_1/shell.py
@@ -1978,6 +1978,19 @@ def do_secgroup_create(cs, args):
     _print_secgroups([secgroup])
 
 
+@utils.arg('secgroup',
+    metavar='<secgroup>',
+    help='ID or name of security group.')
+@utils.arg('name', metavar='<name>', help='Name of security group.')
+@utils.arg('description', metavar='<description>',
+           help='Description of security group.')
+def do_secgroup_update(cs, args):
+    """Update a security group."""
+    sg = _get_secgroup(cs, args.secgroup)
+    secgroup = cs.security_groups.update(sg, args.name, args.description)
+    _print_secgroups([secgroup])
+
+
 @utils.arg('secgroup',
     metavar='<secgroup>',
     help='ID or name of security group.')