diff --git a/app.go b/app.go
index dc8fb1f5..c8d91d78 100644
--- a/app.go
+++ b/app.go
@@ -10,19 +10,22 @@ import (
 	"github.com/astaxie/beego/context"
 )
 
+// FilterFunc defines filter function type.
 type FilterFunc func(*context.Context)
 
+// App defines beego application with a new PatternServeMux.
 type App struct {
 	Handlers *ControllerRegistor
 }
 
-// New returns a new PatternServeMux.
+// NewApp returns a new beego application.
 func NewApp() *App {
 	cr := NewControllerRegistor()
 	app := &App{Handlers: cr}
 	return app
 }
 
+// Run beego application.
 func (app *App) Run() {
 	addr := HttpAddr
 
@@ -84,39 +87,77 @@ func (app *App) Run() {
 	}
 }
 
+// Router adds a url-patterned controller handler.
+// The path argument supports regex rules and specific placeholders.
+// The c argument needs a controller handler implemented beego.ControllerInterface.
+// The mapping methods argument only need one string to define custom router rules.
+// usage:
+//	simple router
+// 	beego.Router("/admin", &admin.UserController{})
+//	beego.Router("/admin/index", &admin.ArticleController{})
+//
+// 	regex router
+//
+//	beego.Router(“/api/:id([0-9]+)“, &controllers.RController{})
+//
+//  custom rules
+//	beego.Router("/api/list",&RestController{},"*:ListFood")
+//	beego.Router("/api/create",&RestController{},"post:CreateFood")
+//	beego.Router("/api/update",&RestController{},"put:UpdateFood")
+//	beego.Router("/api/delete",&RestController{},"delete:DeleteFood")
 func (app *App) Router(path string, c ControllerInterface, mappingMethods ...string) *App {
 	app.Handlers.Add(path, c, mappingMethods...)
 	return app
 }
 
+// AutoRouter adds beego-defined controller handler.
+// if beego.AddAuto(&MainContorlller{}) and MainController has methods List and Page,
+// visit the url /main/list to exec List function or /main/page to exec Page function.
 func (app *App) AutoRouter(c ControllerInterface) *App {
 	app.Handlers.AddAuto(c)
 	return app
 }
 
+// UrlFor does another controller handler with params in current context.
+// The endpoint is formed as path.controller.name to defined the controller method which will run.
+// The values need key-pair data to assign into controller method.
 func (app *App) UrlFor(endpoint string, values ...string) string {
 	return app.Handlers.UrlFor(endpoint, values...)
 }
+
+// [Deprecated] use InsertFilter.
+// Filter adds a FilterFunc under pattern condition and named action.
+// The actions contains BeforeRouter,AfterStatic,BeforeExec,AfterExec and FinishRouter.
 func (app *App) Filter(pattern, action string, filter FilterFunc) *App {
 	app.Handlers.AddFilter(pattern, action, filter)
 	return app
 }
 
+// InsertFilter adds a FilterFunc with pattern condition and action constant.
+// The pos means action constant including
+// beego.BeforeRouter, beego.AfterStatic, beego.BeforeExec, beego.AfterExec and beego.FinishRouter.
 func (app *App) InsertFilter(pattern string, pos int, filter FilterFunc) *App {
 	app.Handlers.InsertFilter(pattern, pos, filter)
 	return app
 }
 
+// SetViewsPath sets view directory path in beego application.
+// it returns beego application self.
 func (app *App) SetViewsPath(path string) *App {
 	ViewsPath = path
 	return app
 }
 
+// SetStaticPath sets static directory path and proper url pattern in beego application.
+// if beego.SetStaticPath("static","public"), visit /static/* to load static file in folder "public".
+// it returns beego application self.
 func (app *App) SetStaticPath(url string, path string) *App {
 	StaticDir[url] = path
 	return app
 }
 
+// DelStaticPath removes the static folder setting in this url pattern in beego application.
+// it returns beego application self.
 func (app *App) DelStaticPath(url string) *App {
 	delete(StaticDir, url)
 	return app
diff --git a/beego.go b/beego.go
index 1b16a422..b2d22cc2 100644
--- a/beego.go
+++ b/beego.go
@@ -10,34 +10,50 @@ import (
 	"github.com/astaxie/beego/session"
 )
 
+// beego web framework version.
 const VERSION = "1.0.0"
 
+// Router adds a patterned controller handler to BeeApp.
+// it's an alias method of App.Router.
 func Router(rootpath string, c ControllerInterface, mappingMethods ...string) *App {
 	BeeApp.Router(rootpath, c, mappingMethods...)
 	return BeeApp
 }
 
+// RESTRouter adds a restful controller handler to BeeApp.
+// its' controller implements beego.ControllerInterface and
+// defines a param "pattern/:objectId" to visit each resource.
 func RESTRouter(rootpath string, c ControllerInterface) *App {
 	Router(rootpath, c)
 	Router(path.Join(rootpath, ":objectId"), c)
 	return BeeApp
 }
 
+// AutoRouter adds defined controller handler to BeeApp.
+// it's same to App.AutoRouter.
 func AutoRouter(c ControllerInterface) *App {
 	BeeApp.AutoRouter(c)
 	return BeeApp
 }
 
+// ErrorHandler registers http.HandlerFunc to each http err code string.
+// usage:
+// 	beego.ErrorHandler("404",NotFound)
+//	beego.ErrorHandler("500",InternalServerError)
 func Errorhandler(err string, h http.HandlerFunc) *App {
 	middleware.Errorhandler(err, h)
 	return BeeApp
 }
 
+// SetViewsPath sets view directory to BeeApp.
+// it's alias of App.SetViewsPath.
 func SetViewsPath(path string) *App {
 	BeeApp.SetViewsPath(path)
 	return BeeApp
 }
 
+// SetStaticPath sets static directory and url prefix to BeeApp.
+// it's alias of App.SetStaticPath.
 func SetStaticPath(url string, path string) *App {
 	if !strings.HasPrefix(url, "/") {
 		url = "/" + url
@@ -46,27 +62,33 @@ func SetStaticPath(url string, path string) *App {
 	return BeeApp
 }
 
+// DelStaticPath removes the static folder setting in this url pattern in beego application.
+// it's alias of App.DelStaticPath.
 func DelStaticPath(url string) *App {
 	delete(StaticDir, url)
 	return BeeApp
 }
 
-//!!DEPRECATED!! use InsertFilter
-//action has four values:
-//BeforRouter
-//AfterStatic
-//BeforExec
-//AfterExec
+// [Deprecated] use InsertFilter.
+// Filter adds a FilterFunc under pattern condition and named action.
+// The actions contains BeforeRouter,AfterStatic,BeforeExec,AfterExec and FinishRouter.
+// it's alias of App.Filter.
 func AddFilter(pattern, action string, filter FilterFunc) *App {
 	BeeApp.Filter(pattern, action, filter)
 	return BeeApp
 }
 
+// InsertFilter adds a FilterFunc with pattern condition and action constant.
+// The pos means action constant including
+// beego.BeforeRouter, beego.AfterStatic, beego.BeforeExec, beego.AfterExec and beego.FinishRouter.
+// it's alias of App.InsertFilter.
 func InsertFilter(pattern string, pos int, filter FilterFunc) *App {
 	BeeApp.InsertFilter(pattern, pos, filter)
 	return BeeApp
 }
 
+// Run beego application.
+// it's alias of App.Run.
 func Run() {
 	// if AppConfigPath not In the conf/app.conf reParse config
 	if AppConfigPath != filepath.Join(AppPath, "conf", "app.conf") {
diff --git a/config.go b/config.go
index 3a03a45c..9baf9aa5 100644
--- a/config.go
+++ b/config.go
@@ -14,54 +14,53 @@ import (
 )
 
 var (
-	BeeApp                 *App
+	BeeApp                 *App // beego application
 	AppName                string
 	AppPath                string
 	AppConfigPath          string
 	StaticDir              map[string]string
-	TemplateCache          map[string]*template.Template
-	StaticExtensionsToGzip []string //Files which should also be compressed with gzip (.js, .css, etc)
+	TemplateCache          map[string]*template.Template // template caching map
+	StaticExtensionsToGzip []string                      // files with should be compressed with gzip (.js,.css,etc)
 	HttpAddr               string
 	HttpPort               int
 	HttpTLS                bool
 	HttpCertFile           string
 	HttpKeyFile            string
-	RecoverPanic           bool
-	AutoRender             bool
+	RecoverPanic           bool // flag of auto recover panic
+	AutoRender             bool // flag of render template automatically
 	ViewsPath              string
-	RunMode                string //"dev" or "prod"
+	RunMode                string // run mode, "dev" or "prod"
 	AppConfig              config.ConfigContainer
-	//related to session
-	GlobalSessions        *session.Manager //GlobalSessions
-	SessionOn             bool             // whether auto start session,default is false
-	SessionProvider       string           // default session provider  memory mysql redis
-	SessionName           string           // sessionName cookie's name
-	SessionGCMaxLifetime  int64            // session's gc maxlifetime
-	SessionSavePath       string           // session savepath if use mysql/redis/file this set to the connectinfo
-	SessionHashFunc       string
-	SessionHashKey        string
-	SessionCookieLifeTime int
-	UseFcgi               bool
-	MaxMemory             int64
-	EnableGzip            bool   // enable gzip
-	DirectoryIndex        bool   //enable DirectoryIndex default is false
-	EnableHotUpdate       bool   //enable HotUpdate default is false
-	HttpServerTimeOut     int64  //set httpserver timeout
-	ErrorsShow            bool   //set weather show errors
-	XSRFKEY               string //set XSRF
-	EnableXSRF            bool
-	XSRFExpire            int
-	CopyRequestBody       bool //When in raw application, You want to the reqeustbody
-	TemplateLeft          string
-	TemplateRight         string
-	BeegoServerName       string
-	EnableAdmin           bool   //enable admin module to log api time
-	AdminHttpAddr         string //admin module http addr
-	AdminHttpPort         int
+	GlobalSessions         *session.Manager // global session mananger
+	SessionOn              bool             // flag of starting session auto. default is false.
+	SessionProvider        string           // default session provider, memory, mysql , redis ,etc.
+	SessionName            string           // the cookie name when saving session id into cookie.
+	SessionGCMaxLifetime   int64            // session gc time for auto cleaning expired session.
+	SessionSavePath        string           // if use mysql/redis/file provider, define save path to connection info.
+	SessionHashFunc        string           // session hash generation func.
+	SessionHashKey         string           // session hash salt string.
+	SessionCookieLifeTime  int              // the life time of session id in cookie.
+	UseFcgi                bool
+	MaxMemory              int64
+	EnableGzip             bool // flag of enable gzip
+	DirectoryIndex         bool // flag of display directory index. default is false.
+	EnableHotUpdate        bool // flag of hot update checking by app self. default is false.
+	HttpServerTimeOut      int64
+	ErrorsShow             bool   // flag of show errors in page. if true, show error and trace info in page rendered with error template.
+	XSRFKEY                string // xsrf hash salt string.
+	EnableXSRF             bool   // flag of enable xsrf.
+	XSRFExpire             int    // the expiry of xsrf value.
+	CopyRequestBody        bool   // flag of copy raw request body in context.
+	TemplateLeft           string
+	TemplateRight          string
+	BeegoServerName        string // beego server name exported in response header.
+	EnableAdmin            bool   // flag of enable admin module to log every request info.
+	AdminHttpAddr          string // http server configurations for admin module.
+	AdminHttpPort          int
 )
 
 func init() {
-	// create beeapp
+	// create beego application
 	BeeApp = NewApp()
 
 	// initialize default configurations
@@ -135,7 +134,8 @@ func init() {
 	}
 }
 
-//parse config now only support ini, next will support json
+// ParseConfig parsed default config file.
+// now only support ini, next will support json.
 func ParseConfig() (err error) {
 	AppConfig, err = config.NewConfig("ini", AppConfigPath)
 	if err != nil {
diff --git a/controller.go b/controller.go
index f33d38dc..f14593a5 100644
--- a/controller.go
+++ b/controller.go
@@ -25,9 +25,12 @@ import (
 )
 
 var (
+	// custom error when user stop request handler manually.
 	USERSTOPRUN = errors.New("User stop run")
 )
 
+// Controller defines some basic http request handler operations, such as
+// http context, template and view, session and xsrf.
 type Controller struct {
 	Ctx            *context.Context
 	Data           map[interface{}]interface{}
@@ -43,6 +46,7 @@ type Controller struct {
 	AppController  interface{}
 }
 
+// ControllerInterface is an interface to uniform all controller handler.
 type ControllerInterface interface {
 	Init(ct *context.Context, controllerName, actionName string, app interface{})
 	Prepare()
@@ -59,6 +63,7 @@ type ControllerInterface interface {
 	CheckXsrfCookie() bool
 }
 
+// Init generates default values of controller operations.
 func (c *Controller) Init(ctx *context.Context, controllerName, actionName string, app interface{}) {
 	c.Data = make(map[interface{}]interface{})
 	c.Layout = ""
@@ -70,42 +75,52 @@ func (c *Controller) Init(ctx *context.Context, controllerName, actionName strin
 	c.AppController = app
 }
 
+// Prepare runs after Init before request function execution.
 func (c *Controller) Prepare() {
 
 }
 
+// Finish runs after request function execution.
 func (c *Controller) Finish() {
 
 }
 
+// Get adds a request function to handle GET request.
 func (c *Controller) Get() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Post adds a request function to handle POST request.
 func (c *Controller) Post() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Delete adds a request function to handle DELETE request.
 func (c *Controller) Delete() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Put adds a request function to handle PUT request.
 func (c *Controller) Put() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Head adds a request function to handle HEAD request.
 func (c *Controller) Head() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Patch adds a request function to handle PATCH request.
 func (c *Controller) Patch() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Options adds a request function to handle OPTIONS request.
 func (c *Controller) Options() {
 	http.Error(c.Ctx.ResponseWriter, "Method Not Allowed", 405)
 }
 
+// Render sends the response with rendered template bytes as text/html type.
 func (c *Controller) Render() error {
 	rb, err := c.RenderBytes()
 
@@ -118,11 +133,13 @@ func (c *Controller) Render() error {
 	return nil
 }
 
+// RenderString returns the rendered template string. Do not send out response.
 func (c *Controller) RenderString() (string, error) {
 	b, e := c.RenderBytes()
 	return string(b), e
 }
 
+// RenderBytes returns the bytes of renderd tempate string. Do not send out response.
 func (c *Controller) RenderBytes() ([]byte, error) {
 	//if the controller has set layout, then first get the tplname's content set the content to the layout
 	if c.Layout != "" {
@@ -175,10 +192,12 @@ func (c *Controller) RenderBytes() ([]byte, error) {
 	return []byte{}, nil
 }
 
+// Redirect sends the redirection response to url with status code.
 func (c *Controller) Redirect(url string, code int) {
 	c.Ctx.Redirect(code, url)
 }
 
+// Aborts stops controller handler and show the error data if code is defined in ErrorMap or code string.
 func (c *Controller) Abort(code string) {
 	status, err := strconv.Atoi(code)
 	if err == nil {
@@ -188,10 +207,13 @@ func (c *Controller) Abort(code string) {
 	}
 }
 
+// StopRun makes panic of USERSTOPRUN error and go to recover function if defined.
 func (c *Controller) StopRun() {
 	panic(USERSTOPRUN)
 }
 
+// UrlFor does another controller handler in this request function.
+// it goes to this controller method if endpoint is not clear.
 func (c *Controller) UrlFor(endpoint string, values ...string) string {
 	if len(endpoint) <= 0 {
 		return ""
@@ -201,8 +223,10 @@ func (c *Controller) UrlFor(endpoint string, values ...string) string {
 	} else {
 		return UrlFor(endpoint, values...)
 	}
+	return ""
 }
 
+// ServeJson sends a json response with encoding charset.
 func (c *Controller) ServeJson(encoding ...bool) {
 	var hasIndent bool
 	var hasencoding bool
@@ -217,6 +241,7 @@ func (c *Controller) ServeJson(encoding ...bool) {
 	c.Ctx.Output.Json(c.Data["json"], hasIndent, hasencoding)
 }
 
+// ServeJson sends a jsonp response.
 func (c *Controller) ServeJsonp() {
 	var hasIndent bool
 	if RunMode == "prod" {
@@ -227,6 +252,7 @@ func (c *Controller) ServeJsonp() {
 	c.Ctx.Output.Jsonp(c.Data["jsonp"], hasIndent)
 }
 
+// ServeJson sends xml response.
 func (c *Controller) ServeXml() {
 	var hasIndent bool
 	if RunMode == "prod" {
@@ -237,6 +263,7 @@ func (c *Controller) ServeXml() {
 	c.Ctx.Output.Xml(c.Data["xml"], hasIndent)
 }
 
+// Input returns the input data map from POST or PUT request body and query string.
 func (c *Controller) Input() url.Values {
 	ct := c.Ctx.Request.Header.Get("Content-Type")
 	if strings.Contains(ct, "multipart/form-data") {
@@ -247,14 +274,18 @@ func (c *Controller) Input() url.Values {
 	return c.Ctx.Request.Form
 }
 
+// ParseForm maps input data map to obj struct.
 func (c *Controller) ParseForm(obj interface{}) error {
 	return ParseForm(c.Input(), obj)
 }
 
+// GetString returns the input value by key string.
 func (c *Controller) GetString(key string) string {
 	return c.Input().Get(key)
 }
 
+// GetStrings returns the input string slice by key string.
+// it's designed for multi-value input field such as checkbox(input[type=checkbox]), multi-selection.
 func (c *Controller) GetStrings(key string) []string {
 	r := c.Ctx.Request
 	if r.Form == nil {
@@ -267,22 +298,29 @@ func (c *Controller) GetStrings(key string) []string {
 	return []string{}
 }
 
+// GetInt returns input value as int64.
 func (c *Controller) GetInt(key string) (int64, error) {
 	return strconv.ParseInt(c.Input().Get(key), 10, 64)
 }
 
+// GetBool returns input value as bool.
 func (c *Controller) GetBool(key string) (bool, error) {
 	return strconv.ParseBool(c.Input().Get(key))
 }
 
+// GetFloat returns input value as float64.
 func (c *Controller) GetFloat(key string) (float64, error) {
 	return strconv.ParseFloat(c.Input().Get(key), 64)
 }
 
+// GetFile returns the file data in file upload field named as key.
+// it returns the first one of multi-uploaded files.
 func (c *Controller) GetFile(key string) (multipart.File, *multipart.FileHeader, error) {
 	return c.Ctx.Request.FormFile(key)
 }
 
+// SaveToFile saves uploaded file to new path.
+// it only operates the first one of mutil-upload form file field.
 func (c *Controller) SaveToFile(fromfile, tofile string) error {
 	file, _, err := c.Ctx.Request.FormFile(fromfile)
 	if err != nil {
@@ -298,6 +336,7 @@ func (c *Controller) SaveToFile(fromfile, tofile string) error {
 	return nil
 }
 
+// StartSession starts session and load old session data info this controller.
 func (c *Controller) StartSession() session.SessionStore {
 	if c.CruSession == nil {
 		c.CruSession = c.Ctx.Input.CruSession
@@ -305,6 +344,7 @@ func (c *Controller) StartSession() session.SessionStore {
 	return c.CruSession
 }
 
+// SetSession puts value into session.
 func (c *Controller) SetSession(name interface{}, value interface{}) {
 	if c.CruSession == nil {
 		c.StartSession()
@@ -312,6 +352,7 @@ func (c *Controller) SetSession(name interface{}, value interface{}) {
 	c.CruSession.Set(name, value)
 }
 
+// GetSession gets value from session.
 func (c *Controller) GetSession(name interface{}) interface{} {
 	if c.CruSession == nil {
 		c.StartSession()
@@ -319,6 +360,7 @@ func (c *Controller) GetSession(name interface{}) interface{} {
 	return c.CruSession.Get(name)
 }
 
+// SetSession removes value from session.
 func (c *Controller) DelSession(name interface{}) {
 	if c.CruSession == nil {
 		c.StartSession()
@@ -326,19 +368,24 @@ func (c *Controller) DelSession(name interface{}) {
 	c.CruSession.Delete(name)
 }
 
+// SessionRegenerateID regenerates session id for this session.
+// the session data have no changes.
 func (c *Controller) SessionRegenerateID() {
 	c.CruSession = GlobalSessions.SessionRegenerateId(c.Ctx.ResponseWriter, c.Ctx.Request)
 	c.Ctx.Input.CruSession = c.CruSession
 }
 
+// DestroySession cleans session data and session cookie.
 func (c *Controller) DestroySession() {
 	GlobalSessions.SessionDestroy(c.Ctx.ResponseWriter, c.Ctx.Request)
 }
 
+// IsAjax returns this request is ajax or not.
 func (c *Controller) IsAjax() bool {
 	return c.Ctx.Input.IsAjax()
 }
 
+// GetSecureCookie returns decoded cookie value from encoded browser cookie values.
 func (c *Controller) GetSecureCookie(Secret, key string) (string, bool) {
 	val := c.Ctx.GetCookie(key)
 	if val == "" {
@@ -365,6 +412,7 @@ func (c *Controller) GetSecureCookie(Secret, key string) (string, bool) {
 	return string(res), true
 }
 
+// SetSecureCookie puts value into cookie after encoded the value.
 func (c *Controller) SetSecureCookie(Secret, name, val string, age int64) {
 	vs := base64.URLEncoding.EncodeToString([]byte(val))
 	timestamp := strconv.FormatInt(time.Now().UnixNano(), 10)
@@ -375,6 +423,7 @@ func (c *Controller) SetSecureCookie(Secret, name, val string, age int64) {
 	c.Ctx.SetCookie(name, cookie, age, "/")
 }
 
+// XsrfToken creates a xsrf token string and returns.
 func (c *Controller) XsrfToken() string {
 	if c._xsrf_token == "" {
 		token, ok := c.GetSecureCookie(XSRFKEY, "_xsrf")
@@ -393,6 +442,9 @@ func (c *Controller) XsrfToken() string {
 	return c._xsrf_token
 }
 
+// CheckXsrfCookie checks xsrf token in this request is valid or not.
+// the token can provided in request header "X-Xsrftoken" and "X-CsrfToken"
+// or in form field value named as "_xsrf".
 func (c *Controller) CheckXsrfCookie() bool {
 	token := c.GetString("_xsrf")
 	if token == "" {
@@ -409,16 +461,18 @@ func (c *Controller) CheckXsrfCookie() bool {
 	return true
 }
 
+// XsrfFormHtml writes an input field contains xsrf token value.
 func (c *Controller) XsrfFormHtml() string {
 	return "<input type=\"hidden\" name=\"_xsrf\" value=\"" +
 		c._xsrf_token + "\"/>"
 }
 
+// GetControllerAndAction gets the executing controller name and action name.
 func (c *Controller) GetControllerAndAction() (controllerName, actionName string) {
 	return c.controllerName, c.actionName
 }
 
-//utils func for controller internal
+// getRandomString returns random string.
 func getRandomString(n int) string {
 	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 	var bytes = make([]byte, n)
diff --git a/filter.go b/filter.go
index 05e5fd49..7e0245a6 100644
--- a/filter.go
+++ b/filter.go
@@ -5,6 +5,8 @@ import (
 	"strings"
 )
 
+// FilterRouter defines filter operation before controller handler execution.
+// it can match patterned url and do filter function when action arrives.
 type FilterRouter struct {
 	pattern     string
 	regex       *regexp.Regexp
@@ -14,6 +16,8 @@ type FilterRouter struct {
 	parseParams map[string]string
 }
 
+// ValidRouter check current request is valid for this filter.
+// if matched, returns parsed params in this request by defined filter router pattern.
 func (mr *FilterRouter) ValidRouter(router string) (bool, map[string]string) {
 	if mr.pattern == "" {
 		return true, nil
diff --git a/flash.go b/flash.go
index 5a670176..f435c155 100644
--- a/flash.go
+++ b/flash.go
@@ -6,18 +6,22 @@ import (
 	"strings"
 )
 
+// the separation string when encoding flash data.
 const BEEGO_FLASH_SEP = "#BEEGOFLASH#"
 
+// FlashData is a tools to maintain data when using across request.
 type FlashData struct {
 	Data map[string]string
 }
 
+// NewFlash return a new empty FlashData struct.
 func NewFlash() *FlashData {
 	return &FlashData{
 		Data: make(map[string]string),
 	}
 }
 
+// Notice writes notice message to flash.
 func (fd *FlashData) Notice(msg string, args ...interface{}) {
 	if len(args) == 0 {
 		fd.Data["notice"] = msg
@@ -26,6 +30,7 @@ func (fd *FlashData) Notice(msg string, args ...interface{}) {
 	}
 }
 
+// Warning writes warning message to flash.
 func (fd *FlashData) Warning(msg string, args ...interface{}) {
 	if len(args) == 0 {
 		fd.Data["warning"] = msg
@@ -34,6 +39,7 @@ func (fd *FlashData) Warning(msg string, args ...interface{}) {
 	}
 }
 
+// Error writes error message to flash.
 func (fd *FlashData) Error(msg string, args ...interface{}) {
 	if len(args) == 0 {
 		fd.Data["error"] = msg
@@ -42,6 +48,8 @@ func (fd *FlashData) Error(msg string, args ...interface{}) {
 	}
 }
 
+// Store does the saving operation of flash data.
+// the data are encoded and saved in cookie.
 func (fd *FlashData) Store(c *Controller) {
 	c.Data["flash"] = fd.Data
 	var flashValue string
@@ -51,6 +59,7 @@ func (fd *FlashData) Store(c *Controller) {
 	c.Ctx.SetCookie("BEEGO_FLASH", url.QueryEscape(flashValue), 0, "/")
 }
 
+// ReadFromRequest parsed flash data from encoded values in cookie.
 func ReadFromRequest(c *Controller) *FlashData {
 	flash := &FlashData{
 		Data: make(map[string]string),