diff --git a/README-cn.md b/README-cn.md
index c7e9c01..26a5b80 100644
--- a/README-cn.md
+++ b/README-cn.md
@@ -1,3 +1,12 @@
+[🇺🇸](/README.md "English")
+[🇨🇳](/README-cn.md "Simplified Chinese")
+[🇯🇵](/README-ja.md "Japanese")
+[🇮🇹](/README-it.md "Italian")
+[🇰🇷](/README-ko.md "Korean")
+[🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
+
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
 # 介绍
diff --git a/README-es.md b/README-es.md
index 24a7f14..58371fb 100644
--- a/README-es.md
+++ b/README-es.md
@@ -1,3 +1,4 @@
+[🇺🇸](/README.md "English")
 [🇨🇳](/README-cn.md "Simplified Chinese")
 [🇯🇵](/README-ja.md "Japanese")
 [🇮🇹](/README-it.md "Italian")
diff --git a/README-it.md b/README-it.md
index 2a3bd5d..0f821c1 100644
--- a/README-it.md
+++ b/README-it.md
@@ -1,7 +1,11 @@
+[🇺🇸](/README.md "English")
 [🇨🇳](/README-cn.md "Simplified Chinese")
 [🇯🇵](/README-ja.md "Japanese")
 [🇮🇹](/README-it.md "Italian")
 [🇰🇷](/README-ko.md "Korean")
+[🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
 
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
diff --git a/README-ja.md b/README-ja.md
index 96f0535..9d2dc34 100644
--- a/README-ja.md
+++ b/README-ja.md
@@ -1,3 +1,12 @@
+[🇺🇸](/README.md "English")
+[🇨🇳](/README-cn.md "Simplified Chinese")
+[🇯🇵](/README-ja.md "Japanese")
+[🇮🇹](/README-it.md "Italian")
+[🇰🇷](/README-ko.md "Korean")
+[🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
+
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
 # はじめに
diff --git a/README-ko.md b/README-ko.md
index dee7bc4..45b5940 100644
--- a/README-ko.md
+++ b/README-ko.md
@@ -1,3 +1,12 @@
+[🇺🇸](/README.md "English")
+[🇨🇳](/README-cn.md "Simplified Chinese")
+[🇯🇵](/README-ja.md "Japanese")
+[🇮🇹](/README-it.md "Italian")
+[🇰🇷](/README-ko.md "Korean")
+[🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
+
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
 # Intro
diff --git a/README-pt.md b/README-pt.md
index e49fa0b..c24ac88 100644
--- a/README-pt.md
+++ b/README-pt.md
@@ -1,3 +1,12 @@
+[🇺🇸](/README.md "English")
+[🇨🇳](/README-cn.md "Simplified Chinese")
+[🇯🇵](/README-ja.md "Japanese")
+[🇮🇹](/README-it.md "Italian")
+[🇰🇷](/README-ko.md "Korean")
+[🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
+
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
 # Introdução
diff --git a/README-ru.md b/README-ru.md
index 054c1fa..e984d67 100644
--- a/README-ru.md
+++ b/README-ru.md
@@ -1,8 +1,11 @@
+[🇺🇸](/README.md "English")
 [🇨🇳](/README-cn.md "Simplified Chinese")
 [🇯🇵](/README-ja.md "Japanese")
 [🇮🇹](/README-it.md "Italian")
 [🇰🇷](/README-ko.md "Korean")
 [🇷🇺](/README-ru.md "Russian")
+[🇧🇷](/README-pt.md "Portuguese")
+[🇪🇸](/README-es.md "Spanish")
 
 [![license](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg)
 
diff --git a/README.md b/README.md
index aa92088..27c7b2d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
+[🇺🇸](/README.md "English")
 [🇨🇳](/README-cn.md "Simplified Chinese")
 [🇯🇵](/README-ja.md "Japanese")
 [🇮🇹](/README-it.md "Italian")