diff --git a/README.md b/README.md
index 55d37ff..5e11f3e 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ int_ = IntOption('int',
                             'expected': 'int',
                             'action': 'disabled',
                             'inverse': True}])
+# Now build Config
 config = Config(OptionDescription('root',
                                   'root',
                                   [choiceoption,
@@ -110,6 +111,15 @@ usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
 prog.py: error: the following arguments are required: --str
 ```
 
+If 'cmd' is 'str', cannot set --int argument:
+
+```bash
+[gnunux@localhost tiramisu-parser]$ python3 prog.py str --int 3
+usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
+               {str,list,int}
+prog.py: error: unrecognized arguments: --int
+```
+
 With all mandatories arguments:
 
 ```bash
@@ -138,3 +148,20 @@ result:
 - v (increase output verbosity): False
 - list (list string option): ['a', 'b', 'c']
 ```
+
+Add --verbosity argument:
+
+```bash
+[gnunux@localhost tiramisu-parser]$ python3 prog.py list --list a b c -v
+result:
+- cmd (choice the sub argument): list
+- verbosity (increase output verbosity): True
+- v (increase output verbosity): True
+- list (list string option): ['a', 'b', 'c']
+[gnunux@localhost tiramisu-parser]$ python3 prog.py list --list a b c --verbosity
+result:
+- cmd (choice the sub argument): list
+- verbosity (increase output verbosity): True
+- v (increase output verbosity): True
+- list (list string option): ['a', 'b', 'c']
+```
diff --git a/test/test_readme.py b/test/test_readme.py
new file mode 100644
index 0000000..e98d1ac
--- /dev/null
+++ b/test/test_readme.py
@@ -0,0 +1,210 @@
+from io import StringIO
+from contextlib import redirect_stdout, redirect_stderr
+
+
+from tiramisu_cmdline_parser import TiramisuCmdlineParser
+from tiramisu import IntOption, StrOption, BoolOption, ChoiceOption, \
+                     SymLinkOption, OptionDescription, Config
+
+
+def get_config():
+    choiceoption = ChoiceOption('cmd',
+                                'choice the sub argument',
+                                ('str', 'list', 'int'),
+                                properties=('mandatory',
+                                            'positional'))
+    booloption = BoolOption('verbosity',
+                            'increase output verbosity',
+                            default=False)
+    short_booloption = SymLinkOption('v', booloption)
+    str_ = StrOption('str',
+                     'string option',
+                     properties=('mandatory',),
+                     requires=[{'option': choiceoption,
+                                'expected': 'str',
+                                'action': 'disabled',
+                                'inverse': True}])
+    list_ = StrOption('list',
+                      'list string option',
+                      multi=True,
+                      properties=('mandatory',),
+                      requires=[{'option': choiceoption,
+                                 'expected': 'list',
+                                 'action': 'disabled',
+                                 'inverse': True}])
+    int_ = IntOption('int',
+                     'int option',
+                     properties=('mandatory',),
+                     requires=[{'option': choiceoption,
+                                'expected': 'int',
+                                'action': 'disabled',
+                                'inverse': True}])
+    return Config(OptionDescription('root',
+                                    'root',
+                                    [choiceoption,
+                                     booloption,
+                                     short_booloption,
+                                     str_,
+                                     list_,
+                                     int_
+                                     ]))
+
+def test_readme_help():
+    output = """usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
+               {str,list,int}
+
+positional arguments:
+  {str,list,int}        choice the sub argument
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -v, --verbosity       increase output verbosity
+  --str STR             string option
+  --list LIST [LIST ...]
+                        list string option
+  --int INT             int option
+"""
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(get_config())
+    f = StringIO()
+    with redirect_stdout(f):
+        parser.print_help()
+    assert f.getvalue() == output
+
+
+def test_readme_positional_mandatory():
+    output = """usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
+               {str,list,int}
+prog.py: error: the following arguments are required: cmd
+"""
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(get_config())
+    f = StringIO()
+    with redirect_stderr(f):
+        try:
+            parser.parse_args([])
+        except SystemExit as err:
+            assert str(err) == "2"
+        else:
+            raise Exception('must raises')
+    assert f.getvalue() == output
+
+
+def test_readme_mandatory():
+    output = """usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
+               {str,list,int}
+prog.py: error: the following arguments are required: --str
+"""
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(get_config())
+    f = StringIO()
+    with redirect_stderr(f):
+        try:
+            parser.parse_args(['str'])
+        except SystemExit as err:
+            assert str(err) == "2"
+        else:
+            raise Exception('must raises')
+    assert f.getvalue() == output
+
+
+def test_readme_cross():
+    output = """usage: prog.py [-h] [-v] --str STR --list LIST [LIST ...] --int INT
+               {str,list,int}
+prog.py: error: unrecognized arguments: --int
+"""
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(get_config())
+    f = StringIO()
+    with redirect_stderr(f):
+        try:
+            parser.parse_args(['str', '--int', '3'])
+        except SystemExit as err:
+            assert str(err) == "2"
+        else:
+            raise Exception('must raises')
+    assert f.getvalue() == output
+
+
+def test_readme_int():
+    output = {'cmd': 'int',
+              'int': 3,
+              'verbosity': False,
+              'v': False}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['int', '--int', '3'])
+    assert config.value.dict() == output
+
+
+def test_readme_int_verbosity():
+    output = {'cmd': 'int',
+              'int': 3,
+              'verbosity': True,
+              'v': True}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['int', '--int', '3', '--verbosity'])
+    assert config.value.dict() == output
+
+
+def test_readme_int_verbosity_short():
+    output = {'cmd': 'int',
+              'int': 3,
+              'verbosity': True,
+              'v': True}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['int', '--int', '3', '-v'])
+    assert config.value.dict() == output
+
+
+def test_readme_str():
+    output = {'cmd': 'str',
+              'str': 'value',
+              'verbosity': False,
+              'v': False}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['str', '--str', 'value'])
+    assert config.value.dict() == output
+
+
+def test_readme_str_int():
+    output = {'cmd': 'str',
+              'str': '3',
+              'verbosity': False,
+              'v': False}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['str', '--str', '3'])
+    assert config.value.dict() == output
+
+
+def test_readme_list():
+    output = {'cmd': 'list',
+              'list': ['a', 'b', 'c'],
+              'verbosity': False,
+              'v': False}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['list', '--list', 'a', 'b', 'c'])
+    assert config.value.dict() == output
+
+
+def test_readme_list_uniq():
+    output = {'cmd': 'list',
+              'list': ['a'],
+              'verbosity': False,
+              'v': False}
+    config = get_config()
+    parser = TiramisuCmdlineParser('prog.py')
+    parser.add_arguments(config)
+    parser.parse_args(['list', '--list', 'a'])
+    assert config.value.dict() == output
diff --git a/tiramisu_cmdline_parser.py b/tiramisu_cmdline_parser.py
index 9ee7c26..d5245fe 100644
--- a/tiramisu_cmdline_parser.py
+++ b/tiramisu_cmdline_parser.py
@@ -158,21 +158,21 @@ class TiramisuCmdlineParser(ArgumentParser):
 
     def parse_args(self, *args, **kwargs):
         kwargs['namespace'] = TiramisuNamespace(self.config)
-        namespaces = super().parse_args(*args, **kwargs)
         try:
+            namespaces = super().parse_args(*args, **kwargs)
             del namespaces.__dict__['_config']
         except PropertiesOptionError as err:
+            name = err._option_bag.option.impl_getname()
+            properties = self.config.unrestraint.option(name).property.get()
+            if 'positional' not in properties:
+                if len(name) == 1 and 'longargument' not in properties:
+                    name = self.prefix_chars + name
+                else:
+                    name = self.prefix_chars * 2 + name
             if err.proptype == ['mandatory']:
-                name = err._option_bag.option.impl_getname()
-                properties = self.config.option(name).property.get()
-                if 'positional' not in properties:
-                    if len(name) == 1 and 'longargument' not in properties:
-                        name = self.prefix_chars + name
-                    else:
-                        name = self.prefix_chars * 2 + name
                 self.error('the following arguments are required: {}'.format(name))
             else:
-                self.error('unexpected error: {}'.format(err))
+                self.error('unrecognized arguments: {}'.format(name))
         return namespaces
 
     def format_usage(self, *args, _forhelp=False, **kwargs):