Add auto to the help list

diff --git a/Binder.lua b/Binder.lua
index 39c42e2..855a24d 100644
--- a/Binder.lua
+++ b/Binder.lua
@@ -252,6 +252,7 @@ function Binder.SlashCommandHelp()
     print("- /binder load <set name> (loads specified keybindings)")
     print("- /binder list (lists all saved bind sets)")
     print("- /binder delete <set name> (deletes specified keybindings)")
+    print("- /binder auto [on||off] (lists or sets automatic mode)")
 end

 function Binder.SlashCommand(argtext)