diff --git a/README.md b/README.md
index 369e649..302b8b7 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,8 @@ from tiramisu import IntOption, StrOption, BoolOption, ChoiceOption, \
 choiceoption = ChoiceOption('cmd',
                             'choice the sub argument',
                             ('str', 'list', 'int'),
-                            properties=('mandatory',))
-#                                        'positional'))
+                            properties=('mandatory',
+                                        'positional'))
 # * a boolean to pass script in verbosity mode with argument -v --verbosity
 booloption = BoolOption('verbosity',
                         'increase output verbosity',
@@ -60,6 +60,7 @@ config = Config(OptionDescription('root',
                                    int_
                                    ]))
 # initialise the parser
+config.property.read_write()
 parser = TiramisuCmdlineParser(config)
 # parse arguments of current script
 parser.parse_args()
diff --git a/tiramisu_cmdline_parser.py b/tiramisu_cmdline_parser.py
index 31cc8e5..9401ed0 100644
--- a/tiramisu_cmdline_parser.py
+++ b/tiramisu_cmdline_parser.py
@@ -166,16 +166,17 @@ class TiramisuCmdlineParser(ArgumentParser):
             if name.startswith(self.prefix_chars):
                 raise ValueError('name cannot startswith "{}"'.format(self.prefix_chars))
             properties = obj.property.get()
-            kwargs = {'help': option.doc().replace('%', '%%'),
-                      'default': SUPPRESS,
-                      'dest': option.path()}
+            kwargs = {'help': option.doc().replace('%', '%%')}
             if 'positional' in properties:
                 #if not 'mandatory' in properties:
                 #    raise ValueError('"positional" argument must be "mandatory" too')
-                args = [name]
+                args = [option.path()]
                 #if option.requires():
+                kwargs['default'] = obj.value.get()
                 kwargs['nargs'] = '?'
             else:
+                kwargs['dest'] = option.path()
+                kwargs['default'] = SUPPRESS
                 if self.fullpath and prefix:
                     name = prefix + '.' + name
                 args = [self._gen_argument(name, properties)]
@@ -240,11 +241,15 @@ class TiramisuCmdlineParser(ArgumentParser):
                 self.error('unrecognized arguments: {}'.format(name))
         if valid_mandatory:
             for key in self.config.value.mandatory():
-                if self.fullpath or '.' not in key:
-                    name = key
+                properties = self.config.option(key).property.get()
+                if 'positional' not in properties:
+                    if self.fullpath or '.' not in key:
+                        name = key
+                    else:
+                        name = key.rsplit('.', 1)[1]
+                    args = self._gen_argument(name, self.config.option(key).property.get())
                 else:
-                    name = key.rsplit('.', 1)[1]
-                args = self._gen_argument(name, self.config.option(key).property.get())
+                    args = key
                 self.error('the following arguments are required: {}'.format(args))
         return namespaces