diff --git a/README.md b/README.md
index bca52f7..7e0fc89 100644
--- a/README.md
+++ b/README.md
@@ -701,18 +701,24 @@ from nats_bridge import smartreceive, smartsend
 
 # Configuration
 SUBJECT = "/device/command"
-REPLY_SUBJECT = "/device/response"
 NATS_URL = "nats://localhost:4222"
 
 async def main():
     nc = await nats.connect(NATS_URL)
     
     async def message_handler(msg):
+        # Receive and parse the incoming message envelope
         env = smartreceive(msg.data)
+        
+        # Extract reply_to from the envelope metadata
+        reply_to = env["reply_to"]
+        
         for dataname, data, type in env["payloads"]:
             if data.get("action") == "read_sensor":
                 response = {"sensor_id": "sensor-001", "value": 42.5}
-                smartsend(REPLY_SUBJECT, [("data", response, "dictionary")])
+                # Send response to the reply_to subject from the request
+                if reply_to:
+                    smartsend(reply_to, [("data", response, "dictionary")])
     
     sid = await nc.subscribe(SUBJECT, cb=message_handler)
     await asyncio.sleep(120)
@@ -740,7 +746,6 @@ const { connect } = require('nats');
 
 // Configuration
 const SUBJECT = "/device/command";
-const REPLY_SUBJECT = "/device/response";
 const NATS_URL = "nats://localhost:4222";
 
 async function main() {
@@ -750,12 +755,19 @@ async function main() {
     
     for await (const msg of sub) {
         const env = await smartreceive(msg);
+        
+        // Extract reply_to from the envelope metadata
+        const replyTo = env["reply_to"];
+        
         for (const payload of env.payloads) {
             if (payload.dataname === "command" && payload.data.action === "read_sensor") {
                 const response = { sensor_id: "sensor-001", value: 42.5 };
-                await smartsend(REPLY_SUBJECT, [
-                    { dataname: "data", data: response, type: "dictionary" }
-                ]);
+                // Send response to the reply_to subject from the request
+                if (replyTo) {
+                    await smartsend(replyTo, [
+                        { dataname: "data", data: response, type: "dictionary" }
+                    ]);
+                }
             }
         }
     }
@@ -782,17 +794,23 @@ using NATS, NATSBridge
 
 # Configuration
 const SUBJECT = "/device/command"
-const REPLY_SUBJECT = "/device/response"
 const NATS_URL = "nats://localhost:4222"
 
 function test_responder()
     conn = NATS.connect(NATS_URL)
     NATS.subscribe(conn, SUBJECT) do msg
         env = NATSBridge.smartreceive(msg, fileserver_download_handler=_fetch_with_backoff)
+        
+        # Extract reply_to from the envelope metadata
+        reply_to = env["reply_to"]
+        
         for (dataname, data, type) in env["payloads"]
             if dataname == "command" && data["action"] == "read_sensor"
                 response = Dict("sensor_id" => "sensor-001", "value" => 42.5)
-                smartsend(REPLY_SUBJECT, [("data", response, "dictionary")])
+                # Send response to the reply_to subject from the request
+                if !isempty(reply_to)
+                    smartsend(reply_to, [("data", response, "dictionary")])
+                end
             end
         end
     end