1 files changed, 3 insertions, 3 deletions
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index bb447f75b4..8abed1f52d 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -312,16 +312,16 @@ class FederationAckCommand(Command):
 
     NAME = "FEDERATION_ACK"
 
-    def __init__(self, instance_name, token):
+    def __init__(self, instance_name: str, token: int):
         self.instance_name = instance_name
         self.token = token
 
     @classmethod
-    def from_line(cls, line):
+    def from_line(cls, line: str) -> "FederationAckCommand":
         instance_name, token = line.split(" ")
         return cls(instance_name, int(token))
 
-    def to_line(self):
+    def to_line(self) -> str:
         return "%s %s" % (self.instance_name, self.token)