diff --git a/pyrogram/client/types/user_and_chats/chat_photo.py b/pyrogram/client/types/user_and_chats/chat_photo.py
index 70e114af..623aaca8 100644
--- a/pyrogram/client/types/user_and_chats/chat_photo.py
+++ b/pyrogram/client/types/user_and_chats/chat_photo.py
@@ -29,10 +29,12 @@ class ChatPhoto(Object):
 
     Parameters:
         small_file_id (``str``):
-            Unique file identifier of small (160x160) chat photo. This file_id can be used only for photo download.
+            File identifier of small (160x160) chat photo.
+            This file_id can be used only for photo download and only for as long as the photo is not changed.
 
         big_file_id (``str``):
-            Unique file identifier of big (640x640) chat photo. This file_id can be used only for photo download.
+            File identifier of big (640x640) chat photo.
+            This file_id can be used only for photo download and only for as long as the photo is not changed.
     """
 
     def __init__(