diff --git a/src/main.rs b/src/main.rs
index 274f97c..b4ec3ec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,6 +18,7 @@ fn main() {
 
         thread::spawn(move || {
             {
+                // in a subscope to release borrow automatically
                 let mut count = counter.lock().unwrap();
                 *count += 1;
             }
@@ -32,6 +33,7 @@ fn handle_connection(counter: Arc<Mutex<usize>>, mut stream: TcpStream) {
     stream.read(&mut buffer).unwrap();
 
     {
+        // in a subscope to unlock automatically
         let count = counter.lock().unwrap();
         println!("Request: {}\n{}", count, String::from_utf8_lossy(&buffer[..]));
     }