diff --git a/README.md b/README.md
index aab64d9..51c7b0f 100644
--- a/README.md
+++ b/README.md
@@ -220,7 +220,7 @@ The `config/development.js` file can be used to configure a local development in
 
 * NODE_ENV=production
 * UPGRADE_HTTPS=true  (upgrade HTTP to HTTPS and use [HSTS](https://developer.mozilla.org/en-US/docs/Web/Security/HTTP_strict_transport_security))
-* PUBLIC_KEY_PIN=base64_encoded_sha256  (use [HPKP](https://developer.mozilla.org/de/docs/Web/Security/Public_Key_Pinning))
+* PUBLIC_KEY_PIN=base64_encoded_sha256  (use [HPKP](https://developer.mozilla.org/en-US/docs/Web/Security/Public_Key_Pinning))
 * MONGO_URI=127.0.0.1:27017/test_db
 * MONGO_USER=db_user
 * MONGO_PASS=db_password