diff --git a/proto/hello_world.proto b/proto/hello_world.proto
index 0d2cb4c..fd8bb14 100644
--- a/proto/hello_world.proto
+++ b/proto/hello_world.proto
@@ -3,11 +3,11 @@ syntax = "proto3";
 option go_package = "gitea.dwysokinski.me/Kichiyaki/grpc-demo/proto";
 
 service Greeter {
-  rpc SayHello (HelloRequest) returns (HelloReply) {}
-  rpc SayHelloToJames (HelloRequest) returns (HelloReply) {}
-  rpc SayHelloClientStream (stream HelloRequest) returns (MultiHelloReply) {}
-  rpc SayHelloServerStream (MultiHelloRequest) returns (stream HelloReply) {}
-  rpc SayHelloBidirectionalStream (stream HelloRequest) returns (stream HelloReply) {}
+  rpc SayHello (HelloRequest) returns (HelloReply) {} // Unary RPC
+  rpc SayHelloToJames (HelloRequest) returns (HelloReply) {} // Unary RPC
+  rpc SayHelloClientStream (stream HelloRequest) returns (MultiHelloReply) {} // Client streaming RPC
+  rpc SayHelloServerStream (MultiHelloRequest) returns (stream HelloReply) {} // Server streaming RPC
+  rpc SayHelloBidirectionalStream (stream HelloRequest) returns (stream HelloReply) {} // Bidirectional streaming RPC
 }
 
 message HelloRequest {