diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index 184ea2d5..a9d29a86 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -2456,7 +2456,8 @@ setAuthenticationPhoneNumber phone_number:string allow_flash_call:Bool is_curren
 resendAuthenticationCode = Ok;
 
 //@description Checks the authentication code. Works only when the current authorization state is authorizationStateWaitCode @code The verification code received via SMS, Telegram message, phone call, or flash call
-//@first_name If the user is not yet registered, the first name of the user; 1-64 characters @last_name If the user is not yet registered; the last name of the user; optional; 0-64 characters
+//@first_name If the user is not yet registered, the first name of the user; 1-64 characters. You can also pass an empty string for unregistered user there to check verification code validness. In the latter case PHONE_NUMBER_UNOCCUPIED error will be returned for valid code
+//@last_name If the user is not yet registered; the last name of the user; optional; 0-64 characters
 checkAuthenticationCode code:string first_name:string last_name:string = Ok;
 
 //@description Checks the authentication password for correctness. Works only when the current authorization state is authorizationStateWaitPassword @password The password to check