diff --git a/parakeet/__init__.py b/parakeet/__init__.py
index e964f70..d4940a3 100644
--- a/parakeet/__init__.py
+++ b/parakeet/__init__.py
@@ -12,6 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.2.0-beta"
+__version__ = "0.2.0-beta.0"
 
 from parakeet import audio, data, datasets, frontend, models, modules, training, utils
diff --git a/setup.py b/setup.py
index 92f92d6..6e95807 100644
--- a/setup.py
+++ b/setup.py
@@ -48,6 +48,8 @@ setup_info = dict(
     description='Speech synthesis tools and models based on Paddlepaddle',
     long_description=long_description,
     license='Apache 2',
+    
+    python_requires='>=3.6',
     install_requires=[
         'numpy',
         'nltk',
@@ -68,9 +70,23 @@ setup_info = dict(
         'g2pM',
         'yacs',
     ],
+    extras_require={
+        'doc': ["sphinx", "sphinx-rtd-theme", "numpydoc"],
+    },
 
     # Package info
     packages=find_packages(exclude=('tests', 'tests.*')),
-    zip_safe=True, )
+    zip_safe=True, 
+    
+    classifiers = [
+        'Development Status :: 4 - Beta',
+        'Intended Audience :: Developers',
+        'Topic :: Scientific/Engineering :: Artificial Intelligence'
+        'License :: OSI Approved :: Apache2 License',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+    ],
+    
+    )
 
 setup(**setup_info)