diff --git a/pkg/core/context.go b/pkg/core/context.go
index 430c892e..da6b240a 100644
--- a/pkg/core/context.go
+++ b/pkg/core/context.go
@@ -12,15 +12,18 @@ const requestIdFieldKey = "REQUEST_ID"
 const tokenClaimsFieldKey = "TOKEN_CLAIMS"
 const responseErrorFieldKey = "RESPONSE_ERROR"
 
+// Context represents the request and response context
 type Context struct {
 	*gin.Context
 	// DO NOT ADD ANY FIELD IN THIS CONTEXT, THIS CONTEXT IS JUST A WRAPPER
 }
 
+// SetRequestId sets the given request id to context
 func (c *Context) SetRequestId(requestId string) {
 	c.Set(requestIdFieldKey, requestId)
 }
 
+// GetRequestId returns the current request id
 func (c *Context) GetRequestId() string {
 	requestId, exists := c.Get(requestIdFieldKey)
 
@@ -31,10 +34,12 @@ func (c *Context) GetRequestId() string {
 	return requestId.(string)
 }
 
+// SetTokenClaims sets the given user token id to context
 func (c *Context) SetTokenClaims(claims *UserTokenClaims) {
 	c.Set(tokenClaimsFieldKey, claims)
 }
 
+// GetTokenClaims returns the current user token
 func (c *Context) GetTokenClaims() *UserTokenClaims {
 	claims, exists := c.Get(tokenClaimsFieldKey)
 
@@ -45,6 +50,7 @@ func (c *Context) GetTokenClaims() *UserTokenClaims {
 	return claims.(*UserTokenClaims)
 }
 
+// GetCurrentUid returns the current user uid by the current user token
 func (c *Context) GetCurrentUid() int64 {
 	claims := c.GetTokenClaims()
 
@@ -61,10 +67,12 @@ func (c *Context) GetCurrentUid() int64 {
 	return uid
 }
 
+// SetResponseError sets the response error
 func (c *Context) SetResponseError(error *errs.Error) {
 	c.Set(responseErrorFieldKey, error)
 }
 
+// GetResponseError returns the response error
 func (c *Context) GetResponseError() *errs.Error {
 	err, exists := c.Get(responseErrorFieldKey)
 
@@ -75,6 +83,7 @@ func (c *Context) GetResponseError() *errs.Error {
 	return err.(*errs.Error)
 }
 
+// WrapContext returns a context wrapped by this file
 func WrapContext(ginCtx *gin.Context) *Context {
 	return &Context{
 		Context: ginCtx,
diff --git a/pkg/core/handler.go b/pkg/core/handler.go
index 1b654d1d..1a5c6161 100644
--- a/pkg/core/handler.go
+++ b/pkg/core/handler.go
@@ -2,6 +2,8 @@ package core
 
 import "github.com/mayswind/lab/pkg/errs"
 
+// MiddlewareHandlerFunc represents the middleware handler function
 type MiddlewareHandlerFunc func(*Context)
 
+// ApiHandlerFunc represents the api handler function
 type ApiHandlerFunc func(*Context) (interface{}, *errs.Error)
diff --git a/pkg/core/token_claims.go b/pkg/core/token_claims.go
index 6ae3a493..9fa66d7c 100644
--- a/pkg/core/token_claims.go
+++ b/pkg/core/token_claims.go
@@ -4,13 +4,16 @@ import (
 	"github.com/dgrijalva/jwt-go"
 )
 
+// TokenType represents token type
 type TokenType byte
 
+// Token types
 const (
 	USER_TOKEN_TYPE_NORMAL      TokenType = 1
 	USER_TOKEN_TYPE_REQUIRE_2FA TokenType = 2
 )
 
+// UserTokenClaims represents user token
 type UserTokenClaims struct {
 	UserTokenId string    `json:"userTokenId"`
 	Username    string    `json:"username,omitempty"`