Add AddChatUserRequest example

Joining-a-chat-or-channel.md

@@ -26,4 +26,19 @@ If all you have is a link like this one: `https://t.me/joinchat/AAAAAFFszQPyPEZ7
 from telethon.tl.functions.messages import ImportChatInviteRequest
 
 updates = client.invoke(ImportChatInviteRequest('AAAAAEHbEkejzxUjAUCfYg'))
+```
+
+## Adding someone else to such chat or channel
+
+If you don't want to add yourself, maybe because you're already in, you can always add someone else with the [`AddChatUserRequest`](https://lonamiwebs.github.io/Telethon/methods/messages/add_chat_user.html), which use is very straightforward:
+
+```python
+from telethon.tl.functions.messages import AddChatUserRequest
+from telethon.helpers import get_input_peer
+
+client.invoke(AddChatUserRequest(
+    chat_id,
+    get_input_peer(user_to_add),
+    fwd_limit=10  # allow the user to see the 10 last messages
+))
 ```