diff --git a/telethon_generator/data/errors.csv b/telethon_generator/data/errors.csv
index aab5bddd..3678feb9 100644
--- a/telethon_generator/data/errors.csv
+++ b/telethon_generator/data/errors.csv
@@ -102,6 +102,7 @@ FILEREF_UPGRADE_NEEDED,406,The file reference needs to be refreshed before being
 FIRSTNAME_INVALID,400,The first name is invalid
 FLOOD_TEST_PHONE_WAIT_X,420,A wait of {seconds} seconds is required in the test servers
 FLOOD_WAIT_X,420,A wait of {seconds} seconds is required
+SLOWMODE_WAIT_X,420,A wait of {seconds} seconds is required
 FOLDER_ID_EMPTY,400,The folder you tried to delete was already empty
 FOLDER_ID_INVALID,400,The folder you tried to use was not valid
 FRESH_RESET_AUTHORISATION_FORBIDDEN,406,The current session is too new and cannot be used to reset other authorisations yet