diff --git a/public/404.html b/public/404.html
index cc6820bba..5b5362192 100644
--- a/public/404.html
+++ b/public/404.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
   <title>Error 404 | Not found</title>
   <meta name="viewport" content="width=device-width,initial-scale=1">
diff --git a/public/422.html b/public/422.html
index e68d2956f..cca90e5a3 100644
--- a/public/422.html
+++ b/public/422.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
   <title>Error 422 | The change you wanted was rejected</title>
   <meta name="viewport" content="width=device-width,initial-scale=1">
diff --git a/public/500.html b/public/500.html
index 71978cdce..0b563452a 100644
--- a/public/500.html
+++ b/public/500.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
   <title>Error 500 | Internal server error</title>
   <meta name="viewport" content="width=device-width,initial-scale=1">
