diff --git a/commands.lua b/commands.lua
index d603aea..2fefacb 100644
--- a/commands.lua
+++ b/commands.lua
@@ -58,7 +58,7 @@ ChatCmdBuilder.new("wormball", function(cmd)
 
   end)
 
-  cmd:sub("showleaderboard :arena :p_name", function(name, arena, p_name)
+  cmd:sub("showleaderboard :arena:word :p_name:username", function(name, arena, p_name)
     if not wormball.show_singleplayer_leaderboard( arena , p_name ) then
         return "Invalid usage: please specify a valid wormball arena name to view its leaderboard."
     end