diff --git a/src/app.rs b/src/app.rs
index c9c23d9cb..34a663ae7 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -245,8 +245,8 @@ where
     }
 }
 
-/// Structure that follows the builder pattern for building application
-/// instances.
+/// Application router builder - Structure that follows the builder pattern
+/// for building application instances.
 pub struct AppRouter<C, P, B, T> {
     chain: C,
     services: Vec<(ResourceDef, HttpNewService<P>)>,
diff --git a/src/extract.rs b/src/extract.rs
index d6e533276..c0af6016d 100644
--- a/src/extract.rs
+++ b/src/extract.rs
@@ -165,17 +165,63 @@ impl<T> From<T> for Path<T> {
     }
 }
 
+/// Extract typed information from the request's path.
+///
+/// ## Example
+///
+/// ```rust
+/// use actix_web::{web, http, App, extract::Path};
+///
+/// /// extract path info from "/{username}/{count}/index.html" url
+/// /// {username} - deserializes to a String
+/// /// {count} -  - deserializes to a u32
+/// fn index(info: Path<(String, u32)>) -> String {
+///     format!("Welcome {}! {}", info.0, info.1)
+/// }
+///
+/// fn main() {
+///     let app = App::new().resource(
+///         "/{username}/{count}/index.html", // <- define path parameters
+///         |r| r.route(web::get().to(index)) // <- register handler with `Path` extractor
+///     );
+/// }
+/// ```
+///
+/// It is possible to extract path information to a specific type that
+/// implements `Deserialize` trait from *serde*.
+///
+/// ```rust
+/// #[macro_use] extern crate serde_derive;
+/// use actix_web::{web, App, extract::Path, Error};
+///
+/// #[derive(Deserialize)]
+/// struct Info {
+///     username: String,
+/// }
+///
+/// /// extract `Info` from a path using serde
+/// fn index(info: Path<Info>) -> Result<String, Error> {
+///     Ok(format!("Welcome {}!", info.username))
+/// }
+///
+/// fn main() {
+///     let app = App::new().resource(
+///         "/{username}/index.html", // <- define path parameters
+///         |r| r.route(web::get().to(index)) // <- use handler with Path` extractor
+///     );
+/// }
+/// ```
 impl<T, P> FromRequest<P> for Path<T>
 where
     T: DeserializeOwned,
 {
     type Error = Error;
-    type Future = FutureResult<Self, Error>;
+    type Future = Result<Self, Error>;
     type Config = ();
 
     #[inline]
     fn from_request(req: &mut ServiceFromRequest<P>) -> Self::Future {
-        Self::extract(req).map_err(ErrorNotFound).into_future()
+        Self::extract(req).map_err(ErrorNotFound)
     }
 }
 
@@ -200,17 +246,17 @@ impl<T: fmt::Display> fmt::Display for Path<T> {
 /// #[macro_use] extern crate serde_derive;
 /// use actix_web::{web, extract, App};
 ///
-///#[derive(Debug, Deserialize)]
-///pub enum ResponseType {
+/// #[derive(Debug, Deserialize)]
+/// pub enum ResponseType {
 ///    Token,
 ///    Code
-///}
+/// }
 ///
-///#[derive(Deserialize)]
-///pub struct AuthRequest {
+/// #[derive(Deserialize)]
+/// pub struct AuthRequest {
 ///    id: u64,
 ///    response_type: ResponseType,
-///}
+/// }
 ///
 /// // Use `Query` extractor for query information.
 /// // This handler get called only if request's query contains `username` field
@@ -248,19 +294,52 @@ impl<T> Query<T> {
     }
 }
 
+/// Extract typed information from from the request's query.
+///
+/// ## Example
+///
+/// ```rust
+/// #[macro_use] extern crate serde_derive;
+/// use actix_web::{web, extract, App};
+///
+/// #[derive(Debug, Deserialize)]
+/// pub enum ResponseType {
+///    Token,
+///    Code
+/// }
+///
+/// #[derive(Deserialize)]
+/// pub struct AuthRequest {
+///    id: u64,
+///    response_type: ResponseType,
+/// }
+///
+/// // Use `Query` extractor for query information.
+/// // This handler get called only if request's query contains `username` field
+/// // The correct request for this handler would be `/index.html?id=64&response_type=Code"`
+/// fn index(info: extract::Query<AuthRequest>) -> String {
+///     format!("Authorization request for client with id={} and type={:?}!", info.id, info.response_type)
+/// }
+///
+/// fn main() {
+///     let app = App::new().resource(
+///        "/index.html",
+///        |r| r.route(web::get().to(index))); // <- use `Query` extractor
+/// }
+/// ```
 impl<T, P> FromRequest<P> for Query<T>
 where
     T: de::DeserializeOwned,
 {
     type Error = Error;
-    type Future = FutureResult<Self, Error>;
+    type Future = Result<Self, Error>;
     type Config = ();
 
     #[inline]
     fn from_request(req: &mut ServiceFromRequest<P>) -> Self::Future {
         serde_urlencoded::from_str::<T>(req.query_string())
-            .map(|val| ok(Query(val)))
-            .unwrap_or_else(|e| err(e.into()))
+            .map(|val| Ok(Query(val)))
+            .unwrap_or_else(|e| Err(e.into()))
     }
 }
 
@@ -282,7 +361,7 @@ impl<T: fmt::Display> fmt::Display for Query<T> {
 /// To extract typed information from request's body, the type `T` must
 /// implement the `Deserialize` trait from *serde*.
 ///
-/// [**FormConfig**](dev/struct.FormConfig.html) allows to configure extraction
+/// [**FormConfig**](struct.FormConfig.html) allows to configure extraction
 /// process.
 ///
 /// ## Example
@@ -436,7 +515,7 @@ impl Default for FormConfig {
 /// To extract typed information from request's body, the type `T` must
 /// implement the `Deserialize` trait from *serde*.
 ///
-/// [**JsonConfig**](dev/struct.JsonConfig.html) allows to configure extraction
+/// [**JsonConfig**](struct.JsonConfig.html) allows to configure extraction
 /// process.
 ///
 /// ## Example
@@ -526,20 +605,51 @@ where
 
 impl<T: Serialize> Responder for Json<T> {
     type Error = Error;
-    type Future = FutureResult<Response, Error>;
+    type Future = Result<Response, Error>;
 
     fn respond_to(self, _: &HttpRequest) -> Self::Future {
         let body = match serde_json::to_string(&self.0) {
             Ok(body) => body,
-            Err(e) => return err(e.into()),
+            Err(e) => return Err(e.into()),
         };
 
-        ok(Response::build(StatusCode::OK)
+        Ok(Response::build(StatusCode::OK)
             .content_type("application/json")
             .body(body))
     }
 }
 
+/// Json extractor. Allow to extract typed information from request's
+/// payload.
+///
+/// To extract typed information from request's body, the type `T` must
+/// implement the `Deserialize` trait from *serde*.
+///
+/// [**JsonConfig**](struct.JsonConfig.html) allows to configure extraction
+/// process.
+///
+/// ## Example
+///
+/// ```rust
+/// #[macro_use] extern crate serde_derive;
+/// use actix_web::{web, extract, App};
+///
+/// #[derive(Deserialize)]
+/// struct Info {
+///     username: String,
+/// }
+///
+/// /// deserialize `Info` from request's body
+/// fn index(info: extract::Json<Info>) -> String {
+///     format!("Welcome {}!", info.username)
+/// }
+///
+/// fn main() {
+///     let app = App::new().resource(
+///        "/index.html",
+///        |r| r.route(web::post().to(index)));
+/// }
+/// ```
 impl<T, P> FromRequest<P> for Json<T>
 where
     T: DeserializeOwned + 'static,
@@ -632,7 +742,7 @@ impl Default for JsonConfig {
 ///
 /// Loads request's payload and construct Bytes instance.
 ///
-/// [**PayloadConfig**](dev/struct.PayloadConfig.html) allows to configure
+/// [**PayloadConfig**](struct.PayloadConfig.html) allows to configure
 /// extraction process.
 ///
 /// ## Example
@@ -677,7 +787,7 @@ where
 ///
 /// Text extractor automatically decode body according to the request's charset.
 ///
-/// [**PayloadConfig**](dev/struct.PayloadConfig.html) allows to configure
+/// [**PayloadConfig**](struct.PayloadConfig.html) allows to configure
 /// extraction process.
 ///
 /// ## Example
@@ -931,6 +1041,17 @@ impl Default for PayloadConfig {
     }
 }
 
+#[doc(hidden)]
+impl<P> FromRequest<P> for () {
+    type Error = Error;
+    type Future = FutureResult<(), Error>;
+    type Config = ();
+
+    fn from_request(_req: &mut ServiceFromRequest<P>) -> Self::Future {
+        ok(())
+    }
+}
+
 macro_rules! tuple_config ({ $($T:ident),+} => {
     impl<$($T,)+> ExtractorConfig for ($($T,)+)
     where $($T: ExtractorConfig + Clone,)+
@@ -944,6 +1065,7 @@ macro_rules! tuple_config ({ $($T:ident),+} => {
 macro_rules! tuple_from_req ({$fut_type:ident, $(($n:tt, $T:ident)),+} => {
 
     /// FromRequest implementation for tuple
+    #[doc(hidden)]
     impl<P, $($T: FromRequest<P> + 'static),+> FromRequest<P> for ($($T,)+)
     {
         type Error = Error;
@@ -995,16 +1117,6 @@ macro_rules! tuple_from_req ({$fut_type:ident, $(($n:tt, $T:ident)),+} => {
     }
 });
 
-impl<P> FromRequest<P> for () {
-    type Error = Error;
-    type Future = FutureResult<(), Error>;
-    type Config = ();
-
-    fn from_request(_req: &mut ServiceFromRequest<P>) -> Self::Future {
-        ok(())
-    }
-}
-
 #[rustfmt::skip]
 mod m {
     use super::*;
diff --git a/src/lib.rs b/src/lib.rs
index f61bf0ace..37fd75912 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,7 @@
 
 mod app;
 pub mod extract;
-pub mod handler;
+mod handler;
 // mod info;
 pub mod blocking;
 pub mod guard;
@@ -19,7 +19,7 @@ pub mod test;
 pub use actix_http::Response as HttpResponse;
 pub use actix_http::{error, http, Error, HttpMessage, ResponseError, Result};
 
-pub use crate::app::App;
+pub use crate::app::{App, AppRouter};
 pub use crate::extract::{FromRequest, Json};
 pub use crate::request::HttpRequest;
 pub use crate::resource::Resource;
@@ -37,30 +37,37 @@ pub mod web {
     use crate::responder::Responder;
     use crate::Route;
 
+    /// Create **route** without configuration.
     pub fn route<P: 'static>() -> Route<P> {
         Route::new()
     }
 
+    /// Create **route** with `GET` method guard.
     pub fn get<P: 'static>() -> Route<P> {
         Route::get()
     }
 
+    /// Create **route** with `POST` method guard.
     pub fn post<P: 'static>() -> Route<P> {
         Route::post()
     }
 
+    /// Create **route** with `PUT` method guard.
     pub fn put<P: 'static>() -> Route<P> {
         Route::put()
     }
 
+    /// Create **route** with `DELETE` method guard.
     pub fn delete<P: 'static>() -> Route<P> {
         Route::delete()
     }
 
+    /// Create **route** with `HEAD` method guard.
     pub fn head<P: 'static>() -> Route<P> {
         Route::new().method(Method::HEAD)
     }
 
+    /// Create **route** and add method guard.
     pub fn method<P: 'static>(method: Method) -> Route<P> {
         Route::new().method(method)
     }
diff --git a/src/request.rs b/src/request.rs
index 48a2dd833..d90627f52 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -6,12 +6,12 @@ use std::rc::Rc;
 use actix_http::http::{HeaderMap, Method, Uri, Version};
 use actix_http::{Error, Extensions, HttpMessage, Message, Payload, RequestHead};
 use actix_router::{Path, Url};
-use futures::future::{ok, FutureResult};
 
 use crate::extract::FromRequest;
 use crate::service::ServiceFromRequest;
 
 #[derive(Clone)]
+/// An HTTP Request
 pub struct HttpRequest {
     pub(crate) head: Message<RequestHead>,
     pub(crate) path: Path<Url>,
@@ -20,7 +20,7 @@ pub struct HttpRequest {
 
 impl HttpRequest {
     #[inline]
-    pub fn new(
+    pub(crate) fn new(
         head: Message<RequestHead>,
         path: Path<Url>,
         extensions: Rc<Extensions>,
@@ -140,14 +140,33 @@ impl HttpMessage for HttpRequest {
     }
 }
 
+/// It is possible to get `HttpRequest` as an extractor handler parameter
+///
+/// ## Example
+///
+/// ```rust
+/// # #[macro_use] extern crate serde_derive;
+/// use actix_web::{web, App, HttpRequest};
+///
+/// /// extract `Thing` from request
+/// fn index(req: HttpRequest) -> String {
+///    format!("Got thing: {:?}", req)
+/// }
+///
+/// fn main() {
+///     let app = App::new().resource("/users/:first", |r| {
+///         r.route(web::get().to(index))
+///     });
+/// }
+/// ```
 impl<P> FromRequest<P> for HttpRequest {
     type Error = Error;
-    type Future = FutureResult<Self, Error>;
+    type Future = Result<Self, Error>;
     type Config = ();
 
     #[inline]
     fn from_request(req: &mut ServiceFromRequest<P>) -> Self::Future {
-        ok(req.clone())
+        Ok(req.clone())
     }
 }
 
diff --git a/src/resource.rs b/src/resource.rs
index f05e998fa..342d801d4 100644
--- a/src/resource.rs
+++ b/src/resource.rs
@@ -18,10 +18,24 @@ use crate::service::{ServiceRequest, ServiceResponse};
 type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, ()>;
 type HttpNewService<P> = BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
 
-/// Resource route definition
+/// *Resource* is an entry in route table which corresponds to requested URL.
 ///
-/// Route uses builder-like pattern for configuration.
-/// If handler is not explicitly set, default *404 Not Found* handler is used.
+/// Resource in turn has at least one route.
+/// Route consists of an handlers objects and list of guards
+/// (objects that implement `Guard` trait).
+/// Resources and rouets uses builder-like pattern for configuration.
+/// During request handling, resource object iterate through all routes
+/// and check guards for specific route, if request matches all
+/// guards, route considered matched and route handler get called.
+///
+/// ```rust
+/// use actix_web::{web, App, HttpResponse};
+///
+/// fn main() {
+///     let app = App::new()
+///         .resource(
+///             "/", |r| r.route(web::get().to(|| HttpResponse::Ok())));
+/// }
 pub struct Resource<P, T = ResourceEndpoint<P>> {
     routes: Vec<Route<P>>,
     endpoint: T,
@@ -58,8 +72,6 @@ where
     >,
 {
     /// Register a new route.
-    /// *Route* is used for route configuration, i.e. adding guards,
-    /// setting up handler.
     ///
     /// ```rust
     /// use actix_web::{web, guard, App, HttpResponse};
@@ -74,12 +86,31 @@ where
     ///         });
     /// }
     /// ```
+    ///
+    /// Multiple routes could be added to a resource.
+    ///
+    /// ```rust
+    /// use actix_web::{web, guard, App, HttpResponse};
+    ///
+    /// fn main() {
+    ///     let app = App::new()
+    ///         .resource("/container/", |r| {
+    ///             r.route(web::get().to(get_handler))
+    ///              .route(web::post().to(post_handler))
+    ///              .route(web::delete().to(delete_handler))
+    ///         });
+    /// }
+    /// # fn get_handler() {}
+    /// # fn post_handler() {}
+    /// # fn delete_handler() {}
+    /// ```
     pub fn route(mut self, route: Route<P>) -> Self {
         self.routes.push(route.finish());
         self
     }
 
-    /// Register a new route and add handler.
+    /// Register a new route and add handler. This route get called for all
+    /// requests.
     ///
     /// ```rust
     /// use actix_web::*;
@@ -148,7 +179,8 @@ where
     /// Register a resource middleware
     ///
     /// This is similar to `App's` middlewares, but
-    /// middlewares get invoked on resource level.
+    /// middleware is not allowed to change response type (i.e modify response's body).
+    /// Middleware get invoked on resource level.
     pub fn middleware<M, F>(
         self,
         mw: F,
diff --git a/src/state.rs b/src/state.rs
index 168a8c899..d4e4c894e 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -3,7 +3,6 @@ use std::rc::Rc;
 
 use actix_http::error::{Error, ErrorInternalServerError};
 use actix_http::Extensions;
-use futures::future::{err, ok, FutureResult};
 use futures::{Async, Future, IntoFuture, Poll};
 
 use crate::extract::FromRequest;
@@ -19,60 +18,61 @@ pub(crate) trait StateFactoryResult {
 }
 
 /// Application state
-pub struct State<S>(Rc<S>);
+pub struct State<T>(Rc<T>);
 
-impl<S> State<S> {
-    pub fn new(state: S) -> State<S> {
+impl<T> State<T> {
+    pub(crate) fn new(state: T) -> State<T> {
         State(Rc::new(state))
     }
 
-    pub fn get_ref(&self) -> &S {
+    /// Get referecnce to inner state type.
+    pub fn get_ref(&self) -> &T {
         self.0.as_ref()
     }
 }
 
-impl<S> Deref for State<S> {
-    type Target = S;
+impl<T> Deref for State<T> {
+    type Target = T;
 
-    fn deref(&self) -> &S {
+    fn deref(&self) -> &T {
         self.0.as_ref()
     }
 }
 
-impl<S> Clone for State<S> {
-    fn clone(&self) -> State<S> {
+impl<T> Clone for State<T> {
+    fn clone(&self) -> State<T> {
         State(self.0.clone())
     }
 }
 
-impl<S: 'static, P> FromRequest<P> for State<S> {
+impl<T: 'static, P> FromRequest<P> for State<T> {
     type Error = Error;
-    type Future = FutureResult<Self, Error>;
+    type Future = Result<Self, Error>;
     type Config = ();
 
     #[inline]
     fn from_request(req: &mut ServiceFromRequest<P>) -> Self::Future {
-        if let Some(st) = req.app_extensions().get::<State<S>>() {
-            ok(st.clone())
+        if let Some(st) = req.app_extensions().get::<State<T>>() {
+            Ok(st.clone())
         } else {
-            err(ErrorInternalServerError(
-                "State is not configured, use App::state()",
+            Err(ErrorInternalServerError(
+                "State is not configured, to configure use App::state()",
             ))
         }
     }
 }
 
-impl<S: 'static> StateFactory for State<S> {
+impl<T: 'static> StateFactory for State<T> {
     fn construct(&self) -> Box<StateFactoryResult> {
         Box::new(StateFut { st: self.clone() })
     }
 }
 
-struct StateFut<S> {
-    st: State<S>,
+struct StateFut<T> {
+    st: State<T>,
 }
 
-impl<S: 'static> StateFactoryResult for StateFut<S> {
+impl<T: 'static> StateFactoryResult for StateFut<T> {
     fn poll_result(&mut self, extensions: &mut Extensions) -> Poll<(), ()> {
         extensions.insert(self.st.clone());
         Ok(Async::Ready(()))
@@ -92,17 +92,17 @@ where
     }
 }
 
-struct StateFactoryFut<S, F>
+struct StateFactoryFut<T, F>
 where
-    F: Future<Item = S>,
+    F: Future<Item = T>,
     F::Error: std::fmt::Debug,
 {
     fut: F,
 }
 
-impl<S: 'static, F> StateFactoryResult for StateFactoryFut<S, F>
+impl<T: 'static, F> StateFactoryResult for StateFactoryFut<T, F>
 where
-    F: Future<Item = S>,
+    F: Future<Item = T>,
     F::Error: std::fmt::Debug,
 {
     fn poll_result(&mut self, extensions: &mut Extensions) -> Poll<(), ()> {