diff --git a/config/locales/doorkeeper.en.yml b/config/locales/doorkeeper.en.yml
index 2be2ef036..ec322f071 100644
--- a/config/locales/doorkeeper.en.yml
+++ b/config/locales/doorkeeper.en.yml
@@ -83,7 +83,10 @@ en:
         invalid_client: Client authentication failed due to unknown client, no client authentication included, or unsupported authentication method.
         invalid_grant: The provided authorization grant is invalid, expired, revoked, does not match the redirection URI used in the authorization request, or was issued to another client.
         invalid_redirect_uri: The redirect uri included is not valid.
-        invalid_request: The request is missing a required parameter, includes an unsupported parameter value, or is otherwise malformed.
+        invalid_request:
+          missing_param: 'Missing required parameter: %{value}.'
+          request_not_authorized: Request need to be authorized. Required parameter for authorizing request is missing or invalid.
+          unknown: The request is missing a required parameter, includes an unsupported parameter value, or is otherwise malformed.
         invalid_resource_owner: The provided resource owner credentials are not valid, or resource owner cannot be found
         invalid_scope: The requested scope is invalid, unknown, or malformed.
         invalid_token: