diff --git a/README.md b/README.md
index 58347c39..b7686ef8 100644
--- a/README.md
+++ b/README.md
@@ -60,12 +60,38 @@ GNES enables large-scale index and semantic search for text-to-text, image-to-im
 <img src=".github/gnes-component-overview.svg" alt="component overview">
 </p>
 
-<h2 align="center">Install</h2>
+<h2 align="center">Install GNES</h2>
 
+There are two ways to get GNES, either as a docker image or as a PyPi package. 
+For cloud users, we highly recommend using GNES as a docker image. 
 
+## Run GNES as a Docker Image
 
+#### via [Docker cloud](https://cloud.docker.com/u/gnes/repository/list)
 
-<h2 align="center">Getting Started</h2>
+```bash
+docker pull gnes/gnes:latest
+docker run gnes/gnes:latest --help
+```
+
+#### via Tencent Container service
+
+We also provide a public mirror hosted on Tencent Cloud, from which Chinese mainland users can pull the image faster.
+
+```bash
+docker login --username=xxx ccr.ccs.tencentyun.com  # login to Tencent Cloud so that we can pull from it
+docker pull ccr.ccs.tencentyun.com/gnes/gnes:latest
+docker run ccr.ccs.tencentyun.com/gnes/gnes:latest --help
+```
+
+> You may pull and run different versions by changing the `latest` to a version tag, e.g. `v0.0.24`.
+
+## Install via `pip`
+
+Install
+
+
+<h2 align="center">Quick Start</h2>
 
 As a cloud-native application, GNES requires an **orchestration engine** to coordinate all micro-services. Currently, we support Kubernetes, Docker Swarm and a built-in solution.  Click on one of the icons below to get started.
 
diff --git a/gnes/cli/parser.py b/gnes/cli/parser.py
index 8517b40d..b6aea372 100644
--- a/gnes/cli/parser.py
+++ b/gnes/cli/parser.py
@@ -18,15 +18,18 @@
 
 import argparse
 
-IDX_PORT_DELTA = 2
-
 
 def set_base_parser():
     from .. import __version__
+    from termcolor import colored
     # create the top-level parser
     parser = argparse.ArgumentParser(
-        description='GNES v%s: Generic Neural Elastic Search '
-                    'is an end-to-end solution for semantic text search' % __version__)
+        description='%s, a cloud-native semantic search system '
+                    'based on deep neural network. '
+                    'It enables large-scale index and semantic search for text-to-text, image-to-image, '
+                    'video-to-video and any content form. Visit %s for tutorials and documentations.' % (
+                        colored('GNES v%s: Generic Neural Elastic Search' % __version__, 'green'),
+                        colored('https://gnes.ai', 'cyan', attrs=['underline'])))
     parser.add_argument('-v', '--version', action='version', version='%(prog)s ' + __version__)
     parser.add_argument('--verbose', action='store_true', default=False,
                         help='turn on detailed logging for debug')
@@ -49,7 +52,7 @@ def set_composer_parser(parser=None):
     parser.add_argument('--yaml_path', type=argparse.FileType('r'),
                         default=resource_stream(
                             'gnes', '/'.join(('resources', 'config', 'compose', 'default.yml'))),
-                            help='yaml config of the service')
+                        help='yaml config of the service')
     parser.add_argument('--html_path', type=argparse.FileType('w', encoding='utf8'),
                         default='./gnes-board.html',
                         help='output path of the HTML file, will contain all possible generations')
@@ -182,7 +185,7 @@ def set_indexer_service_parser(parser=None):
 
     # encoder's port_out is indexer's port_in
     parser.set_defaults(port_in=parser.get_default('port_out'),
-                        port_out=parser.get_default('port_out') + IDX_PORT_DELTA,
+                        port_out=parser.get_default('port_out') + 2,
                         socket_in=SocketType.PULL_CONNECT,
                         socket_out=SocketType.PUB_BIND)
     return parser
@@ -260,7 +263,9 @@ def set_http_service_parser(parser=None):
 def get_main_parser():
     # create the top-level parser
     parser = set_base_parser()
-    sp = parser.add_subparsers(dest='cli')
+    sp = parser.add_subparsers(dest='cli', title='GNES sub-commands',
+                               description='use "gnes [sub-command] --help" '
+                                           'to get detailed information about each sub-command')
 
     set_grpc_frontend_parser(sp.add_parser('frontend', help='start a grpc frontend service'))
     set_indexer_service_parser(sp.add_parser('index', help='start an indexer service'))
@@ -269,5 +274,5 @@ def get_main_parser():
     set_preprocessor_service_parser(sp.add_parser('preprocess', help='start a preprocessor service'))
     set_http_service_parser(sp.add_parser('client_http', help='start a http service'))
     set_cli_client_parser(sp.add_parser('client_cli', help='start a grpc client'))
-    set_composer_flask_parser(sp.add_parser('compose', help='start a GNES composer to simplify config generation'))
+    set_composer_flask_parser(sp.add_parser('compose', help='start a GNES Board and visualize YAML config'))
     return parser
diff --git a/gnes/resources/compose/gnes-board.html b/gnes/resources/compose/gnes-board.html
index 36732e8a..822048c7 100644
--- a/gnes/resources/compose/gnes-board.html
+++ b/gnes/resources/compose/gnes-board.html
@@ -141,7 +141,7 @@
 </head>
 <body>
 <nav class="navbar navbar-light bg-light">
-    <a class="navbar-brand" href="#">
+    <a class="navbar-brand" href="https://gnes.ai">
         <svg version="1.1" style="height: 30px" viewBox="0.0 0.0 432.0524934383202 157.11023622047244" fill="none"
              stroke="none" stroke-linecap="square" stroke-miterlimit="10"
              xmlns="http://www.w3.org/2000/svg">
diff --git a/setup.py b/setup.py
index b54bcb79..3a134bb3 100644
--- a/setup.py
+++ b/setup.py
@@ -40,19 +40,29 @@
     'ruamel.yaml>=0.15.89',
     'pyzmq>=17.1.0',
 ]
-bert_dep = ['bert-serving-server>=1.8.6', 'bert-serving-client>=1.8.6']
-elmo_dep = ['elmoformanylangs @ git+https://github.com/HIT-SCIR/ELMoForManyLangs.git@master#egg=elmoformanylangs-0.0.2',
-            'paramiko', 'pattern3']
-flair_dep = ['flair>=0.4.1']
-nlp_dep = list(set(bert_dep + flair_dep))
-annoy_dep = ['annoy==1.15.2']
-chinese_dep = ['jieba']
-cn_nlp_dep = list(set(chinese_dep + nlp_dep))
-vision_dep = ['opencv-python>=4.0.0', 'torchvision==0.3.0', 'imagehash>=4.0']
-leveldb_dep = ['plyvel>=1.0.5']
-test_dep = ['pylint', 'memory_profiler>=0.55.0', 'psutil>=5.6.1', 'gputil>=1.4.0']
-http_dep = ['flask', 'flask-compress', 'flask-cors', 'flask-json', 'aiohttp==3.5.4']
-all_dep = list(set(base_dep + cn_nlp_dep + vision_dep + leveldb_dep + test_dep + annoy_dep))
+
+extras_dep = {
+    'bert': ['bert-serving-server>=1.8.6', 'bert-serving-client>=1.8.6'],
+    # 'elmo': [
+    #     'elmoformanylangs @ git+https://github.com/HIT-SCIR/ELMoForManyLangs.git@master#egg=elmoformanylangs-0.0.2',
+    #     'paramiko', 'pattern3'],
+    'flair': ['flair>=0.4.1'],
+    'annoy': ['annoy==1.15.2'],
+    'chinese': ['jieba'],
+    'vision': ['opencv-python>=4.0.0', 'torchvision==0.3.0', 'imagehash>=4.0'],
+    'leveldb': ['plyvel>=1.0.5'],
+    'test': ['pylint', 'memory_profiler>=0.55.0', 'psutil>=5.6.1', 'gputil>=1.4.0'],
+    'http': ['flask', 'flask-compress', 'flask-cors', 'flask-json', 'aiohttp==3.5.4']
+}
+
+
+def combine_dep(new_key, base_keys):
+    extras_dep[new_key] = list(set(k for v in base_keys for k in extras_dep[v]))
+
+
+combine_dep('nlp', ['bert', 'flair'])
+combine_dep('cn_nlp', ['chinese', 'nlp'])
+combine_dep('all', [k for k in extras_dep if k != 'elmo'])
 
 setup(
     name=pkg_name,
@@ -75,19 +85,7 @@
     ],
     ext_modules=extensions,
     install_requires=base_dep,
-    extras_require={
-        'bert': bert_dep,
-        # 'elmo': elmo_dep,   # not welcome by pip
-        'flair': flair_dep,
-        'nlp': nlp_dep,
-        'annoy': annoy_dep,
-        'chinese': chinese_dep,
-        'cn_nlp': cn_nlp_dep,
-        'vision': vision_dep,
-        'leveldb': leveldb_dep,
-        'test': test_dep,
-        'all': all_dep,
-    },
+    extras_require=extras_dep,
     entry_points={
         'console_scripts': ['gnes=gnes.cli:main'],
     },