diff --git a/Json-service.md b/Json-service.md
index 795a97f..36a251f 100644
--- a/Json-service.md
+++ b/Json-service.md
@@ -7,7 +7,8 @@ It is possible to communicate with the server over the network using named pipes
 `nc -l -p 9182 <sigsocket | signal-cli --output=json -u +33123456789 jsonRpc >sigsocket &`
 
 To communicate with the server from the same machine (localhost), issue the command:
-`nc localhost 9182`
+
+`nc localhost 9182` <-- note that the port number must match the port number above
 
 It will await your entries in the required format. Be sure to include the arbitrary "id" field if you want to receive a response! The response will contain the same "id" as its last field. For example: