diff --git a/README.md b/README.md
new file mode 100644
index 0000000..318a972
--- /dev/null
+++ b/README.md
@@ -0,0 +1,102 @@
+script-manager
+==============
+
+
+[![Build Status](https://scrutinizer-ci.com/g/yetone/script-manager/badges/build.png?b=master)](https://scrutinizer-ci.com/g/yetone/script-manager/build-status/master)
+
+
+A command-line interface. Just a simple and crude implementation of Flask-Script.
+
+
+# Examples
+
+If you create a `test.py` file like this:
+
+```python
+from script_manager import Manager
+
+manager = Manager('I am a command')
+
+
+@manager.command
+def run(host='127.0.0.1', port=8080, hehe=1):
+    print('Running at http://{}:{}'.format(host, port))
+
+
+@manager.command
+def test(name, age):
+    """Just print my information
+
+    :param name: This is my name
+    :param age: This is my age
+    """
+    print('My name is {}, and I have {} years old.'.format(name, age))
+
+
+if __name__ == '__main__':
+    manager.run()
+```
+
+Then you can run command in shell:
+
+```shell
+➜ python test.py -h
+usage: test.py [-h] run test
+
+I am a command
+
+positional arguments:
+  run
+  test        Just print my information
+
+optional arguments:
+  -h, --help  show this help message and exit
+
+```
+
+and:
+
+```shell
+➜ python test.py run -h
+usage: test.py [-h] [-H HOST] [-p PORT] [--hehe HEHE]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -H HOST, --host HOST
+  -p PORT, --port PORT
+  --hehe HEHE
+
+```
+
+and:
+
+```shell
+➜ python test.py test -h
+usage: test.py [-h] name age
+
+Just print my information
+
+positional arguments:
+  name        This is my name
+  age         This is my age
+
+optional arguments:
+  -h, --help  show this help message and exit
+
+```
+
+and:
+
+```shell
+➜ python test.py run -H 0.0.0.0 -p 8888
+Running at http://0.0.0.0:8888
+
+```
+
+and:
+
+```shell
+➜ python test.py test yetone 12
+My name is yetone, and I have 12 years old.
+
+```
diff --git a/README.rst b/README.rst
deleted file mode 100644
index fa1ed70..0000000
--- a/README.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-script-manager
-==============
-
-.. image:: https://travis-ci.org/yetone/script-manager.png?branch=master
-        :target: https://travis-ci.org/yetone/script-manager
-
-A command-line interface. Just a simple and crude implementation of Flask-Script.
diff --git a/script_manager/command.py b/script_manager/command.py
index 17583d1..a51d7cd 100644
--- a/script_manager/command.py
+++ b/script_manager/command.py
@@ -12,7 +12,9 @@ def __init__(self, func, docstring=None):
             docstring = parse_docstring(func.__doc__)
         self.docstring = docstring
 
-        self.arg_parser = argparse.ArgumentParser(description=self.docstring and self.docstring.description)
+        self.arg_parser = argparse.ArgumentParser(
+            description=self.docstring and self.docstring.description
+        )
 
         argspec = getargspec(func)
         args = argspec.args
@@ -24,6 +26,9 @@ def __init__(self, func, docstring=None):
         defaults = defaults or {}
 
         for arg in args + list(defaults.keys()):
+            if arg == 'help':
+                raise Exception("Your arg can't named as 'help'!")
+
             arg_kwargs = {}
 
             if self.docstring and arg in self.docstring.params:
@@ -49,9 +54,21 @@ def __init__(self, func, docstring=None):
             else:
                 arg_kwargs['type'] = type(default)
 
-            self.add_argument('-%s' % arg[0],
-                              '--%s' % arg,
-                              **arg_kwargs)
+            prefix_letter = arg[0]
+            if prefix_letter == 'h':
+                prefix_letter = 'H'
+
+            brief_flag = '-%s' % prefix_letter
+            flag = '--%s' % arg
+
+            string_actions = self.get_string_actions()
+
+            if brief_flag in string_actions:
+                brief_flag = None
+
+            arg_args = filter(None, (brief_flag, flag))
+
+            self.add_argument(*arg_args, **arg_kwargs)
 
         self.func = func
         self.__doc__ = func.__doc__
@@ -59,6 +76,9 @@ def __init__(self, func, docstring=None):
     def add_argument(self, *args, **kwargs):
         self.arg_parser.add_argument(*args, **kwargs)
 
+    def get_string_actions(self):
+        return self.arg_parser._option_string_actions
+
     def run(self, *args):
         _args = self.arg_parser.parse_args(args)
         self.func(**_args.__dict__)
diff --git a/tests.py b/tests.py
index e9fa453..5104f24 100644
--- a/tests.py
+++ b/tests.py
@@ -23,6 +23,7 @@ def run(command_line, manager_run):
 
 
 class Test(unittest.TestCase):
+
     @pytest.fixture(autouse=True)
     def inject_fixtures(self, capsys):
         self.capsys = capsys
@@ -162,3 +163,16 @@ def wow(a, b, c=1):
         self.assertIn("I'm a", out)
         self.assertIn("I'm b", out)
         self.assertIn("I'm c", out)
+
+    def test_conflict_flag(self):
+        manager = Manager()
+
+        @manager.command
+        def hello(host='127.0.0.1', boy=1, bird=2):
+            print('hello')
+
+        run('manage.py hello -h', manager.run)
+        out, err = self.capsys.readouterr()
+        self.assertIn('-H HOST, --host HOST', out)
+        self.assertIn('-b BOY, --boy BOY', out)
+        self.assertIn('--bird BIRD', out)
diff --git a/tox.ini b/tox.ini
index 17ab3d9..7b262b3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,5 +4,7 @@ envlist = py{27,36}
 
 [testenv]
 passenv = *
-deps = pytest
-commands = pytest tests.py
\ No newline at end of file
+deps =
+     pytest
+     pytest-cov
+commands = pytest tests.py --cov=script_manager