diff --git a/config.js b/config.js
index <HASH>..<HASH> 100644
--- a/config.js
+++ b/config.js
@@ -14,7 +14,10 @@ config.items =
 	, invalidRequestMessage:
 		{ def: "Invalid request. Make sure you are respecting the sprite maker api (https://github.com/vigour-io/vigour-img/blob/master/README.md#user-content-api) and that the requested data exists." }
 	, port:
-		{ def: 8000 }
+		{ def: 8000
+		, cli: "-p, --port <nb>"
+		, desc: "Port on which the server should listen"
+		}
 	, maxWidth:
 		{ def: 10000 }
 	, maxHeight:
Add command-line option to change port