diff --git a/telethon/client/messages.py b/telethon/client/messages.py
index e0ef93b4..9ed86c95 100644
--- a/telethon/client/messages.py
+++ b/telethon/client/messages.py
@@ -1146,6 +1146,10 @@ class MessageMethods:
         If neither message nor maximum ID are provided, all messages will be
         marked as read by assuming that ``max_id = 0``.
 
+        If a message or maximum ID is provided, all the messages up to and
+        including such ID will be marked as read (for all messages whose ID
+        ≤ max_id).
+
         See also `Message.mark_read() <telethon.tl.custom.message.Message.mark_read>`.
 
         Arguments
@@ -1156,8 +1160,8 @@ class MessageMethods:
                 Either a list of messages or a single message.
 
             max_id (`int`):
-                Overrides messages, until which message should the
-                acknowledge should be sent.
+                Until which message should the read acknowledge be sent for.
+                This has priority over the ``message`` parameter.
 
             clear_mentions (`bool`):
                 Whether the mention badge should be cleared (so that
diff --git a/telethon_generator/data/errors.csv b/telethon_generator/data/errors.csv
index 13d2e86a..652d06ed 100644
--- a/telethon_generator/data/errors.csv
+++ b/telethon_generator/data/errors.csv
@@ -250,6 +250,7 @@ SHORTNAME_OCCUPY_FAILED,400,An error occurred when trying to register the short-
 SLOWMODE_WAIT_X,420,A wait of {seconds} seconds is required before sending another message in this chat
 START_PARAM_EMPTY,400,The start parameter is empty
 START_PARAM_INVALID,400,Start parameter invalid
+STATS_MIGRATE_X,303,The channel statistics must be fetched from DC {dc}
 STICKERSET_INVALID,400,The provided sticker set is invalid
 STICKERS_EMPTY,400,No sticker provided
 STICKER_EMOJI_INVALID,400,Sticker emoji invalid