diff --git a/compiler/error/source/400_BAD_REQUEST.csv b/compiler/error/source/400_BAD_REQUEST.csv
index 31b644ce..71014ba0 100644
--- a/compiler/error/source/400_BAD_REQUEST.csv
+++ b/compiler/error/source/400_BAD_REQUEST.csv
@@ -27,4 +27,5 @@ INPUT_METHOD_INVALID|The method called is invalid
 PASSWORD_HASH_INVALID|Two-step verification password is invalid
 USERNAME_NOT_OCCUPIED|The username is not occupied by anyone
 USERNAME_INVALID|The username is invalid
-MESSAGE_ID_INVALID|The message id is invalid
\ No newline at end of file
+MESSAGE_ID_INVALID|The message id is invalid
+MESSAGE_NOT_MODIFIED|The message was not modified
\ No newline at end of file