diff --git a/test/test_option_owner.py b/test/test_option_owner.py
index 8131c84..0a751be 100644
--- a/test/test_option_owner.py
+++ b/test/test_option_owner.py
@@ -36,6 +36,17 @@ def test_default_owner():
     dm.setowner(cfg, owners.user)
     assert dm.getowner(cfg) == owners.user
 
+def test_add_owner():
+    gcdummy = BoolOption('dummy', 'dummy', default=False)
+    descr = OptionDescription('tiramisu', '', [gcdummy])
+    cfg = Config(descr)
+    assert cfg.dummy == False
+    dm = cfg.unwrap_from_path('dummy')
+    assert dm.getowner(cfg) == 'default'
+    owners.add_owner("gen_config")
+    dm.setowner(cfg, owners.gen_config)
+    assert dm.getowner(cfg) == owners.gen_config
+
 def test_owner_is_not_a_string():
     gcdummy = BoolOption('dummy', 'dummy', default=False)
     descr = OptionDescription('tiramisu', '', [gcdummy])
diff --git a/test/test_parsing_group.py b/test/test_parsing_group.py
index 10c7a93..bfb0df8 100644
--- a/test/test_parsing_group.py
+++ b/test/test_parsing_group.py
@@ -59,9 +59,9 @@ def test_get_group_type():
     grp = config.unwrap_from_path('creole.general')
     assert grp.get_group_type() == groups.family
     assert grp.get_group_type() == 'family'
-    assert isinstance(grp.get_group_type(), groups.GroupName)
+    assert isinstance(grp.get_group_type(), groups.GroupType)
     grp.set_group_type(groups.default)
-    assert isinstance(grp.get_group_type(), groups.DefaultGroupName)
+    assert isinstance(grp.get_group_type(), groups.DefaultGroupType)
     assert grp.get_group_type() == groups.default
     assert grp.get_group_type() == 'default'
 
diff --git a/tiramisu/config.py b/tiramisu/config.py
index fbfdb69..ff8b9cc 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -329,7 +329,6 @@ class Config(object):
             if not isinstance(who, owners.Owner):
                 raise TypeError("invalid owner [{0}] for option: {1}".format(
                                 str(who), name))
-            print "ssdfsdfsdfsdfsdf", type(child)
             child.setoption(self, value)
             child.setowner(self, who)
         else:
@@ -458,13 +457,13 @@ class Config(object):
         """iteration on groups objects only.
         All groups are returned if `group_type` is `None`, otherwise the groups
         can be filtered by categories (families, or whatever).
-        :param group_type: if defined, is an instance of `groups.GroupName`
-                           or `groups.MasterGroupName` that lives in
+        :param group_type: if defined, is an instance of `groups.GroupType`
+                           or `groups.MasterGroupType` that lives in
                            `settings.groups`
 
         """
         if group_type is not None:
-            if not isinstance(group_type, groups.GroupName):
+            if not isinstance(group_type, groups.GroupType):
                 raise TypeError("Unknown group_type: {0}".format(group_type))
         for child in self._cfgimpl_descr._children:
             if isinstance(child, OptionDescription):
diff --git a/tiramisu/option.py b/tiramisu/option.py
index 7f78717..989d4ba 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -539,12 +539,12 @@ class OptionDescription(HiddenBaseType, DisabledBaseType):
     def set_group_type(self, group_type, master=None):
         """sets a given group object to an OptionDescription
 
-        :param group_type: an instance of `GroupName` or `MasterGroupName`
+        :param group_type: an instance of `GroupType` or `MasterGroupType`
                               that lives in `setting.groups`
         """
-        if isinstance(group_type, groups.GroupName):
+        if isinstance(group_type, groups.GroupType):
             self.group_type = group_type
-            if isinstance(group_type, groups.MasterGroupName):
+            if isinstance(group_type, groups.MasterGroupType):
                 if master is None:
                     raise ConfigError('this group type ({0}) needs a master '
                             'for OptionDescription {1}'.format(group_type,
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index 39e84f9..dedf27a 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -37,16 +37,16 @@ class _const:
 # ____________________________________________________________
 class GroupModule(_const):
     "emulates a module to manage unique group (OptionDescription) names"
-    class GroupName(str):
+    class GroupType(str):
         """allowed normal group (OptionDescription) names
         *normal* means : groups that are not master
         """
         pass
-    class DefaultGroupName(GroupName):
+    class DefaultGroupType(GroupType):
         """groups that are default (typically 'default')"""
         pass
 
-    class MasterGroupName(GroupName):
+    class MasterGroupType(GroupType):
         """allowed normal group (OptionDescription) names
         *master* means : groups that have the 'master' attribute set
         """
@@ -62,11 +62,11 @@ def populate_groups():
     # populates normal or master groups
     for grp in _available_group_names:
         if grp in _available_groups_with_a_master:
-            setattr(groups, grp, groups.MasterGroupName(grp))
+            setattr(groups, grp, groups.MasterGroupType(grp))
         elif grp in _available_default_groups:
-            setattr(groups, grp, groups.DefaultGroupName(grp))
+            setattr(groups, grp, groups.DefaultGroupType(grp))
         else:
-            setattr(groups, grp, groups.GroupName(grp))
+            setattr(groups, grp, groups.GroupType(grp))
 # names are in the module now
 populate_groups()
 # ____________________________________________________________
@@ -93,6 +93,13 @@ def populate_owners():
     """
     setattr(owners, 'default', owners.DefaultOwner('default'))
     setattr(owners,'user', owners.Owner('user'))
+    def add_owner(name):
+        """
+        :param name: the name of the new owner
+        """
+        setattr(owners, name, owners.Owner(name))
+    setattr(owners, 'add_owner', add_owner)
+
 # names are in the module now
 populate_owners()
 #____________________________________________________________