diff --git a/README.md b/README.md
index ec74fee..fa63cb8 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ from purerpc import Server
 
 class Greeter(GreeterServicer):
     async def SayHello(self, message):
-        return HelloReply(message="Hello, " + message.name)
+        return HelloReply(message=f"Hello {message.name}")
 
     async def SayHelloToMany(self, input_messages):
         async for message in input_messages:
diff --git a/example/client.py b/example/client.py
index aac718a..32e5b46 100644
--- a/example/client.py
+++ b/example/client.py
@@ -1,7 +1,7 @@
 """Greeter client."""
-
 import anyio
 import purerpc
+
 from greeter_grpc import GreeterStub
 from greeter_pb2 import HelloReply, HelloRequest
 
diff --git a/example/server.py b/example/server.py
index b315aa6..a434839 100644
--- a/example/server.py
+++ b/example/server.py
@@ -1,13 +1,13 @@
 """Greeter server."""
+from purerpc import Server
 
 from greeter_grpc import GreeterServicer
 from greeter_pb2 import HelloReply, HelloRequest
-from purerpc import Server
 
 
 class Greeter(GreeterServicer):
     async def SayHello(self, message):
-        return HelloReply(message="Hello, " + message.name)
+        return HelloReply(message=f"Hello, {message.name}")
 
     async def SayHelloToMany(self, input_messages):
         async for message in input_messages: