diff --git a/shvatka/tgbot/handlers/admin.py b/shvatka/tgbot/handlers/admin.py
index 7840776d..89bf98c2 100644
--- a/shvatka/tgbot/handlers/admin.py
+++ b/shvatka/tgbot/handlers/admin.py
@@ -12,11 +12,17 @@
 
 
 async def merge_teams_command(
-        message: types.Message,
-        command: CommandObject,
-        game_log: GameLogWriter,
-        dao: HolderDao,
+    message: types.Message,
+    command: CommandObject,
+    game_log: GameLogWriter,
+    dao: HolderDao,
 ):
+    if not command.args:
+        await message.reply(
+            "После команды следует указать аргументы. "
+            "Сначала id команды в новом движке, а потом id команды с форума."
+        )
+        return
     old_id, new_id = map(int, command.args.split())
     primary = await get_team_by_id(new_id, dao.team)
     assert primary.captain
diff --git a/shvatka/tgbot/views/commands.py b/shvatka/tgbot/views/commands.py
index 137da7e4..57eec1c6 100644
--- a/shvatka/tgbot/views/commands.py
+++ b/shvatka/tgbot/views/commands.py
@@ -89,12 +89,14 @@ def __str__(self) -> str:
 )
 
 
-MERGE_TEAMS = BotCommand(command="merge_teams", description="объединить достижения команды в разных источниках")
+MERGE_TEAMS = BotCommand(
+    command="merge_teams", description="объединить достижения команды в разных источниках"
+)
 HELP_GAME_ADMIN = CommandsGroup(
     "Команды администратора игры",
     [
         MERGE_TEAMS,
-    ]
+    ],
 )