diff --git a/engineering_tools/msgIntersect.py b/engineering_tools/msgIntersect.py
index 34818dcd3b..b3e4a8d897 100644
--- a/engineering_tools/msgIntersect.py
+++ b/engineering_tools/msgIntersect.py
@@ -1,4 +1,13 @@
 ## Receive and Forward SAE J2735 Message Payload
+# This script receives messages sent by V2X Hub, strips the Active Message File header, and forwards only the message/payload to CARMA Messenger.
+# The Active Message File is an ASCII-encoded hex string that is required by RSUs. Most other applications require only the message payload
+# found at the end of the file, encoded as a UTF-8 hex string. 
+
+# The script can be run on either PC running V2X Hub or CARMA Messenger. The following configurations must be made:
+# ip_listen, port_listen: IPv4 Address and Port where messages will be received. Must match IP:Port set in Immediate Forward Plugin.
+# ip_send, port_send: IPv4 Address and Port where payload will be sent. Must match IP, Port set in carma-cohda-dsrc-driver dsrc_driver/config/params.yaml.
+# This script assumes both V2X Hub and CARMA Messenger are running on either the same PC or two separate PCs within the same local network. 
+
 
 import socket
 from time import sleep
@@ -24,7 +33,7 @@ def main():
     ip_listen = '127.0.0.1'
     ip_send = '192.168.0.146'
     port_listen = 1516  # listen to Immediate Forward Plugin
-    port_send = 5398    # send to CARMA
+    port_send = 5398    # send to CARMA listening_port
 
     sk_listen = listen(ip_listen, port_listen)