diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4d2741..a5c0bd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `batch_upload` tests
 - `read_json` method in `util.py`
 ### Changed
+- `README.md` updated
 - `upload` method in `reserver_obj.py`
 - `batch_upload` method `reserver_obj.py`
 ## [0.2] - 2024-06-17
diff --git a/README.md b/README.md
index 969dabc..2ad6526 100644
--- a/README.md
+++ b/README.md
@@ -71,11 +71,17 @@ Reserver is an open source Python package that offers the ability to quickly
 ## Usage
 
 ### Programmatically 
+Reserve a package name in main PyPI (pypi.org)
 ```python
 from reserver import PyPIUploader
-uploader = PyPIUploader(PYPI_API_TOKEN, test_pypi= False)
+uploader = PyPIUploader(PYPI_TOKEN, test_pypi=False)
 uploader.upload("CONSIDERED_NAME_FOR_YOUR_PACKAGE")
 ```
+Reserve batch of names with custom user-defined parameters in test PyPI (test.pypi.org)
+```python
+uploader = PyPIUploader(TEST_PYPI_TOKEN, test_pypi=True)
+uploader.batch_upload(["PACKAGE_NAME_1", "PACKAGE_NAME_2"], ["config1.json", "config2.json"])
+```
 ### CLI
 ⚠️ You can use `reserver` or `python -m reserver` to run this program
 #### Version
@@ -85,13 +91,50 @@ reserver --version
 ```
 #### Reserve in test PyPI (test.pypi.org)
 ```console
-reserver --name sample_name1 sample_name2 --token=PYPI_TOKEN --test
+reserver --name sample_name1 sample_name2 --token=TEST_PYPI_TOKEN --test
 ```
 #### Reserve in main PyPI (pypi.org)
 ```console
 reserver --name sample_name1 sample_name2 --token=PYPI_TOKEN
 ```
+#### Customizing package parameters
+
+You can customize the following package parameters for reservations on PyPI using the Reserver CLI. The details and defaults are provided in the table below.
+
+| Parameter | Type | Default | Description |
+|---|---|---|---|
+| `description` | string | `This name has been reserved using Reserver` | A short description of your PyPI package name reservation. |
+| `author` | string | `Development Team` | The name of the author or development team. |
+| `author_email` | email address | `test@test.com` | An email address for contact. |
+| `url` | web address | `https://url.com` | The project's main repository URL. |
+| `download_url` | web address | `https://download_url.com` | The download URL for the package. |
+| `source` | web address | `https://github.com/source` | The source code repository URL. |
+| `license` | string | `MIT` | The license under which your package is distributed. |
+
+There are two ways to define these custom parameters:
+
+**1. Single `param.json` for all packages:**
+
+This approach uses a single JSON file (`param.json`) to define common parameters for all packages. This file could hold information like those described in the table.
+
+Here's how to use this method:
+
+```console
+reserver --name sample_name1 sample_name2 --param config.json --token=PYPI_TOKEN
+```
+**2. Dedicated `param.json` per package:**
+
+This approach allows for more customization by having a separate JSON file for each package. Each file would contain parameters specific to that particular package.
+
+Here's how this method works:
+
+```console
+reserver --name sample_name1 sample_name2 --param name1_param.json name2_param.json --token=PYPI_TOKEN
+```
+
+Choose the method that best suits your needs. Using a single `param.json` is efficient for packages with similar information, while separate files offer more granular control.
 
+⚠️ You can use all available features on both `pypi.org` and `test.pypi.org`.
 ## Issues & bug reports
 
 Just fill an issue and describe it. We'll check it ASAP! or send an email to [reserver@openscilab.com](mailto:reserver@openscilab.com "reserver@openscilab.com"). 
diff --git a/reserver/reserver_obj.py b/reserver/reserver_obj.py
index ceb3669..5c908d1 100644
--- a/reserver/reserver_obj.py
+++ b/reserver/reserver_obj.py
@@ -10,6 +10,7 @@
 from .util import has_named_parameter, remove_dir, read_json
 from .reserver_func import does_package_exist, generate_template_setup_py
 
+
 class PyPIUploader:
     """
     The Reserver PyPIUploader class reserves a package name by uploading a template repo to pypi account.
@@ -43,7 +44,7 @@ def batch_upload(self, names, user_params_path=None):
         :return: Number of successfully reserved packages
         """
         reserved_successfully = 0
-        if user_params_path == None:
+        if user_params_path is None:
             for name in names:
                 if self.upload(name):
                     reserved_successfully += 1
@@ -78,9 +79,9 @@ def upload(self, package_name, user_parameters=None):
             print("This package already exists in PyPI.")
             return False
 
-        if user_parameters != None:
+        if user_parameters is not None:
             user_parameters = read_json(user_parameters)
-        
+
         generate_template_setup_py(package_name, user_parameters)
 
         environ["TWINE_USERNAME"] = self.username
@@ -97,17 +98,16 @@ def upload(self, package_name, user_parameters=None):
         # prevent from uploading any other previously build library in this path.
         if path.exists(generated_dist_folder):
             remove_dir(generated_dist_folder)
-
-        commands = [executable + " " + generated_setup_file_path + " sdist bdist_wheel "]
+        commands = [f'"{executable}" "{generated_setup_file_path}" sdist bdist_wheel']
         if self.test_pypi:
             commands += [
-                executable + " -m twine upload --repository testpypi " + generated_tar_gz_file,
-                executable + " -m twine upload --repository testpypi " + generated_wheel_file,
+                f'"{executable}" -m twine upload --repository testpypi "{generated_tar_gz_file}"',
+                f'"{executable}" -m twine upload --repository testpypi "{generated_wheel_file}"',
             ]
         else:
             commands += [
-                executable + " -m twine upload --verbose " + generated_tar_gz_file,
-                executable + " -m twine upload --verbose " + generated_wheel_file,
+                f'"{executable}" -m twine upload --verbose "{generated_tar_gz_file}"',
+                f'"{executable}" -m twine upload --verbose "{generated_wheel_file}"',
             ]
         # Run the commands
         publish_failed = False
@@ -123,7 +123,7 @@ def upload(self, package_name, user_parameters=None):
                 error = e.output
                 try:
                     error = error.decode(chardet.detect(error)['encoding'])
-                except:
+                except BaseException:
                     error = error.decode('utf-8')
                 if command == commands[-2]:
                     if "403" in error and "Invalid or non-existent authentication information" in error:
diff --git a/reserver/util.py b/reserver/util.py
index 769e1b1..520e7ed 100644
--- a/reserver/util.py
+++ b/reserver/util.py
@@ -7,6 +7,7 @@
 from .reserver_errors import ReserverBaseError
 from .reserver_param import INVALID_CONFIG_FILE_NAME_ERROR, PARAM_FILE_DOES_NOT_EXIST_ERROR
 
+
 def has_named_parameter(func, param_name):
     """
     Check whether the given function has a parameter named param_name or not.