diff --git a/context/param/conv.go b/context/param/conv.go
index 8e580c2e..e961b4ad 100644
--- a/context/param/conv.go
+++ b/context/param/conv.go
@@ -8,6 +8,7 @@ import (
 	"github.com/astaxie/beego/logs"
 )
 
+// ConvertParams converts http method params to values that will be passed to the method controller as arguments
 func ConvertParams(methodParams []*MethodParam, methodType reflect.Type, ctx *beecontext.Context) (result []reflect.Value) {
 	result = make([]reflect.Value, 0, len(methodParams))
 	for i := 0; i < len(methodParams); i++ {
@@ -55,15 +56,14 @@ func getParamValue(param *MethodParam, ctx *beecontext.Context) string {
 func parseValue(param *MethodParam, paramValue string, paramType reflect.Type) (result reflect.Value, err error) {
 	if paramValue == "" {
 		return reflect.Zero(paramType), nil
-	} else {
-		parser := getParser(param, paramType)
-		value, err := parser.parse(paramValue, paramType)
-		if err != nil {
-			return result, err
-		}
-
-		return safeConvert(reflect.ValueOf(value), paramType)
 	}
+	parser := getParser(param, paramType)
+	value, err := parser.parse(paramValue, paramType)
+	if err != nil {
+		return result, err
+	}
+
+	return safeConvert(reflect.ValueOf(value), paramType)
 }
 
 func safeConvert(value reflect.Value, t reflect.Type) (result reflect.Value, err error) {
diff --git a/context/param/methodparams.go b/context/param/methodparams.go
index 23fd6661..28772504 100644
--- a/context/param/methodparams.go
+++ b/context/param/methodparams.go
@@ -5,7 +5,7 @@ import (
 	"strings"
 )
 
-//Keeps param information to be auto passed to controller methods
+//MethodParam keeps param information to be auto passed to controller methods
 type MethodParam struct {
 	name     string
 	location paramLocation
@@ -22,6 +22,7 @@ const (
 	header
 )
 
+//New creates a new MethodParam with name and specific options
 func New(name string, opts ...MethodParamOption) *MethodParam {
 	return newParam(name, nil, opts)
 }
@@ -34,6 +35,7 @@ func newParam(name string, parser paramParser, opts []MethodParamOption) (param
 	return
 }
 
+//Make creates an array of MethodParmas or an empty array
 func Make(list ...*MethodParam) []*MethodParam {
 	if len(list) > 0 {
 		return list
diff --git a/context/param/options.go b/context/param/options.go
index 0013c31e..846a59f6 100644
--- a/context/param/options.go
+++ b/context/param/options.go
@@ -4,24 +4,30 @@ import (
 	"fmt"
 )
 
+// MethodParamOption defines a func which apply options on a MethodParam
 type MethodParamOption func(*MethodParam)
 
+// IsRequired indicates that this param is required and can not be ommited from the http request
 var IsRequired MethodParamOption = func(p *MethodParam) {
 	p.required = true
 }
 
+// InHeader indicates that this param is passed via an http header
 var InHeader MethodParamOption = func(p *MethodParam) {
 	p.location = header
 }
 
+// InPath indicates that this param is part of the URL path
 var InPath MethodParamOption = func(p *MethodParam) {
 	p.location = path
 }
 
+// InBody indicates that this param is passed as an http request body
 var InBody MethodParamOption = func(p *MethodParam) {
 	p.location = body
 }
 
+// Default provides a default value for the http param
 func Default(defValue interface{}) MethodParamOption {
 	return func(p *MethodParam) {
 		if defValue != nil {
diff --git a/context/response/renderer.go b/context/response/renderer.go
index f5f9a52d..2a4d2797 100644
--- a/context/response/renderer.go
+++ b/context/response/renderer.go
@@ -6,6 +6,7 @@ import (
 	beecontext "github.com/astaxie/beego/context"
 )
 
+// Renderer defines an http response renderer
 type Renderer interface {
 	Render(ctx *beecontext.Context)
 }
@@ -16,12 +17,14 @@ func (f rendererFunc) Render(ctx *beecontext.Context) {
 	f(ctx)
 }
 
+// StatusCode sets the http response status code
 type StatusCode int
 
 func (s StatusCode) Error() string {
 	return strconv.Itoa(int(s))
 }
 
+// Render sets the http status code
 func (s StatusCode) Render(ctx *beecontext.Context) {
 	ctx.Output.SetStatus(int(s))
 }
diff --git a/context/response/responses.go b/context/response/responses.go
index 5fbe4be1..c033edf7 100644
--- a/context/response/responses.go
+++ b/context/response/responses.go
@@ -4,7 +4,8 @@ import (
 	beecontext "github.com/astaxie/beego/context"
 )
 
-func Json(value interface{}, encoding ...bool) Renderer {
+// JSON renders value to the response as JSON
+func JSON(value interface{}, encoding ...bool) Renderer {
 	return rendererFunc(func(ctx *beecontext.Context) {
 		var (
 			hasIndent   = true
@@ -28,12 +29,14 @@ func errorRenderer(err error) Renderer {
 	})
 }
 
-func Redirect(localurl string) statusCodeWithRender {
+// Redirect renders http 302 with a URL
+func Redirect(localurl string) Renderer {
 	return statusCodeWithRender{302, func(ctx *beecontext.Context) {
 		ctx.Redirect(302, localurl)
 	}}
 }
 
+// RenderMethodResult renders the return value of a controller method to the output
 func RenderMethodResult(result interface{}, ctx *beecontext.Context) {
 	if result != nil {
 		renderer, ok := result.(Renderer)
@@ -42,7 +45,7 @@ func RenderMethodResult(result interface{}, ctx *beecontext.Context) {
 			if ok {
 				renderer = errorRenderer(err)
 			} else {
-				renderer = Json(result)
+				renderer = JSON(result)
 			}
 		}
 		renderer.Render(ctx)
diff --git a/router.go b/router.go
index ebe70e72..33096039 100644
--- a/router.go
+++ b/router.go
@@ -813,7 +813,7 @@ func (p *ControllerRegister) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 			default:
 				if !execController.HandlerFunc(runMethod) {
 					method := vc.MethodByName(runMethod)
-					var in []reflect.Value = param.ConvertParams(methodParams, method.Type(), context)
+					in := param.ConvertParams(methodParams, method.Type(), context)
 					out := method.Call(in)
 
 					//For backward compatibility we only handle response if we had incoming methodParams