diff --git a/plugins/portname/init.lua b/plugins/portname/init.lua
index b6403d2cbb4..98601ec8b13 100644
--- a/plugins/portname/init.lua
+++ b/plugins/portname/init.lua
@@ -5,8 +5,10 @@
 --   "ports":{
 --     "<ioport name>":{
 --       "labels":{
---         "player":<int player number>,
---         "name":"<field label>"
+--         "<field mask>":{
+--           "player":<int player number>,
+--           "name":"<field label>"
+--         }
 --     },{
 --       ...
 --     }