diff --git a/README.md b/README.md
index 2bd7d235..9f409b96 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Spectree
+# SpecTree
 
 
 [![GitHub Actions](https://github.com/0b01001001/spectree/workflows/Python%20package/badge.svg)](https://github.com/0b01001001/spectree/actions)
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 83352eae..1c5868e1 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -95,6 +95,7 @@ cases, in Starlette are lower cases.
    config
    response
    plugins
+   models
    utils
 
 
diff --git a/docs/source/models.rst b/docs/source/models.rst
new file mode 100644
index 00000000..be0743d9
--- /dev/null
+++ b/docs/source/models.rst
@@ -0,0 +1,5 @@
+Models
+==========
+
+.. automodule:: spectree.models
+   :members:
diff --git a/spectree/config.py b/spectree/config.py
index f910b794..7c3be926 100644
--- a/spectree/config.py
+++ b/spectree/config.py
@@ -8,40 +8,73 @@
 
 
 class ModeEnum(str, Enum):
+    """the mode of the SpecTree validator"""
+
+    #: includes undecorated routes and routes decorated by this instance
     normal = "normal"
+    #: only includes routes decorated by this instance
     strict = "strict"
+    #: includes all the routes
     greedy = "greedy"
 
 
 class Contact(BaseModel):
+    """contact information"""
+
+    #: name of the contact
     name: str
-    url: AnyUrl = ""
-    email: EmailStr = ""
+    #: contact url
+    url: AnyUrl = None
+    #: contact email address
+    email: EmailStr = None
 
 
 class License(BaseModel):
+    """license information"""
+
+    #: name of the license
     name: str
-    url: AnyUrl = ""
+    #: license url
+    url: AnyUrl = None
 
 
 class Configuration(BaseSettings):
     # OpenAPI configurations
+    #: title of the service
     title: str = "Service API Document"
+    #: service OpenAPI document description
     description: str = None
+    #: service version
     version: str = "0.1.0"
+    #: terms of service url
     terms_of_service: AnyUrl = None
+    #: author contact information
     contact: Contact = None
+    #: license information
     license: License = None
 
     # SpecTree configurations
+    #: OpenAPI doc route path prefix (i.e. /apidoc/)
     path: str = "apidoc"
+    #: OpenAPI file route path suffix (i.e. /apidoc/openapi.json)
     filename: str = "openapi.json"
+    #: OpenAPI version (doesn't affect anything)
     openapi_version: str = "3.0.3"
+    #: the mode of the SpecTree validator :class:`ModeEnum`
     mode: ModeEnum = ModeEnum.normal
+    #: A dictionary of documentation page templates. The key is the
+    #: name of the template, that is also used in the URL path, while the value is used
+    #: to render the documentation page content. (Each page template should contain a
+    #: `{spec_url}` placeholder, that'll be replaced by the actual OpenAPI spec URL in
+    #: the rendered documentation page
     page_templates = DEFAULT_PAGE_TEMPLATES
+    #: opt-in type annotation feature, see the README examples
     annotations = False
+    #: servers section of OAS :py:class:`spectree.models.Server`
     servers: Optional[List[Server]] = []
+    #: OpenAPI `securitySchemes` :py:class:`spectree.models.SecurityScheme`
     security_schemes: Optional[List[SecurityScheme]] = None
+    #: OpenAPI `security` JSON at the global level
     security: Dict = {}
 
     class Config: