diff --git a/telethon_examples/interactive_telegram_client.py b/telethon_examples/interactive_telegram_client.py
index ee179a42..52c2c356 100644
--- a/telethon_examples/interactive_telegram_client.py
+++ b/telethon_examples/interactive_telegram_client.py
@@ -354,7 +354,7 @@ class InteractiveTelegramClient(TelegramClient):
                     update.message, get_display_name(who)
                 ))
             else:
-                sprint('<< {} sent "{}"]'.format(
+                sprint('<< {} sent "{}"'.format(
                     get_display_name(who), update.message
                 ))
 
diff --git a/telethon_generator/error_descriptions b/telethon_generator/error_descriptions
index 500504d7..65894ba1 100644
--- a/telethon_generator/error_descriptions
+++ b/telethon_generator/error_descriptions
@@ -45,7 +45,7 @@ PHONE_NUMBER_OCCUPIED=The phone number is already in use
 PHONE_NUMBER_UNOCCUPIED=The phone number is not yet being used
 PHOTO_INVALID_DIMENSIONS=The photo dimensions are invalid
 TYPE_CONSTRUCTOR_INVALID=The type constructor is invalid
-USERNAME_INVALID=Unacceptable username. Must match r"[a-zA-Z][\w\d]{3,30}[a-zA-Z\d]"
+USERNAME_INVALID=Nobody is using this username, or the username is unacceptable. If the latter, it must match r"[a-zA-Z][\w\d]{3,30}[a-zA-Z\d]"
 USERNAME_NOT_MODIFIED=The username is not different from the current username
 USERNAME_NOT_OCCUPIED=The username is not in use by anyone else yet
 USERNAME_OCCUPIED=The username is already taken