diff --git a/themes/hugo-agency-theme/layouts/index.html b/themes/hugo-agency-theme/layouts/index.html
index 13eb8d6..81f72e2 100644
--- a/themes/hugo-agency-theme/layouts/index.html
+++ b/themes/hugo-agency-theme/layouts/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="{{ with .Site.LanguageCode }}{{ . }}{{ else }}de-DE{{ end }}">
+<html lang="a{{ with .Site.LanguageCode }}{{ . }}{{ else }}de-DE{{ end }}">
 
   {{ partial "head.html" . }}
 
diff --git a/themes/hugo-agency-theme/layouts/partials/head.html b/themes/hugo-agency-theme/layouts/partials/head.html
index 1630430..5b37f27 100644
--- a/themes/hugo-agency-theme/layouts/partials/head.html
+++ b/themes/hugo-agency-theme/layouts/partials/head.html
@@ -1,4 +1,5 @@
 <head>
+  <meta host-identifier="gh" />
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
