diff --git a/common_config.php b/common_config.php
index c34eb4c..9c9f9fc 100644
--- a/common_config.php
+++ b/common_config.php
@@ -74,7 +74,7 @@ function print_langs(){
 		}else{
 			$uri='?'.htmlspecialchars($query)."&amp;lang=$code";
 		}
-		echo " <a href=\"$uri\" target='_self'>$name</a>";
+		echo " <a href=\"$uri\" target='_self' hreflang=\"$code\">$name</a>";
 	}
 	echo '</small>';
 }
diff --git a/www/admin.php b/www/admin.php
index 8a26107..1e88893 100644
--- a/www/admin.php
+++ b/www/admin.php
@@ -8,7 +8,7 @@ try{
 	die($I['nodb']);
 }
 asort($categories);
-echo '<!DOCTYPE html><html><head>';
+echo '<!DOCTYPE html><html lang="'.$language.'><head>';
 echo "<title>$I[admintitle]</title>";
 echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
 echo '<meta name=viewport content="width=device-width, initial-scale=1">';
diff --git a/www/test.php b/www/test.php
index 41a7181..a8ee383 100644
--- a/www/test.php
+++ b/www/test.php
@@ -2,7 +2,7 @@
 require_once(__DIR__.'/../common_config.php');
 $style = '.red{color:red} .green{color:green} .software-link{text-align:center;font-size:small}';
 send_headers([$style]);
-echo '<!DOCTYPE html><html><head>';
+echo '<!DOCTYPE html><html lang="'.$language.'"><head>';
 echo "<title>$I[testtitle]</title>";
 echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
 echo '<meta name="author" content="Daniel Winzen">';
