diff --git a/Retrieving-an-entity.md b/Retrieving-an-entity.md
index c936bf8..2119a21 100644
--- a/Retrieving-an-entity.md
+++ b/Retrieving-an-entity.md
@@ -4,7 +4,7 @@ An "entity" is used to refer to either an [`User`](https://lonamiwebs.github.io/
 ```python
 from telethon.tl.functions.contacts import ResolveUsernameRequest
 
-result = client.invoke(ResolveUsernameRequest('username'))
+result = client(ResolveUsernameRequest('username'))
 found_chats = result.chats
 found_users = result.users
 # result.peer may be a PeerUser, PeerChat or PeerChannel
@@ -34,7 +34,9 @@ from telethon.tl.types.contacts import Contacts
 
 # `.sign_in()´ returns your User, otherwise use:
 self_user = client.get_me()
-contacts = client.invoke(GetContactsRequest(self_user.access_hash))
+
+# Even an empty hash for GetContactsRequest seems to work
+contacts = client(GetContactsRequest(self_user.access_hash))
 if isinstance(contacts, Contacts):
     users = contacts.users
     contacts = contacts.contacts