diff --git a/_includes/main_nav.html b/_includes/main_nav.html
index b22750d8..543e2eb3 100644
--- a/_includes/main_nav.html
+++ b/_includes/main_nav.html
@@ -13,7 +13,7 @@
         {% for page in pages %}
           <div class="dropdown-item btn-icon">
             <div class="float-right">
-              <a href="{{ page.url }}">{{ page.language }}</a>
+              <a href="{{ page.url }}" hreflang="{{ page.lang }}">{{ page.language }}</a>
             </div>
           </div>
         {% endfor %}
@@ -102,7 +102,7 @@
               {% for page in pages %}
                 <div class="dropdown-item btn-icon">
                   <div class="float-right">
-                    <a href="{{ page.url }}">{{ page.language }}</a>
+                    <a href="{{ page.url }}" hreflang="{{ page.lang }}">{{ page.language }}</a>
                   </div>
                 </div>
               {% endfor %}
diff --git a/_includes/main_nav_tr.html b/_includes/main_nav_tr.html
index 4fd0451e..91e185a2 100644
--- a/_includes/main_nav_tr.html
+++ b/_includes/main_nav_tr.html
@@ -13,7 +13,7 @@
         {% for page in pages %}
           <div class="dropdown-item btn-icon">
             <div class="float-right">
-              <a href="{{ page.url }}">{{ page.language }}</a>
+              <a href="{{ page.url }}" hreflang="{{ page.lang }}">{{ page.language }}</a>
             </div>
           </div>
         {% endfor %}
@@ -102,7 +102,7 @@
               {% for page in pages %}
               <div class="dropdown-item btn-icon">
                 <div class="float-right">
-                  <a href="{{ page.url }}">{{ page.language }}</a>
+                  <a href="{{ page.url }}" hreflang="{{ page.lang }}">{{ page.language }}</a>
                 </div>
               </div>
               {% endfor %}
diff --git a/_layouts/default.html b/_layouts/default.html
index c058ed8c..6ae2d484 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="en">
+<html lang="{{ page.lang }}">
 
     <head>
 
