diff --git a/desktop.nix b/desktop.nix
index f7bbf96..8a1a7e3 100644
--- a/desktop.nix
+++ b/desktop.nix
@@ -51,6 +51,12 @@
   };
 
   # Export the current path for the awesome derivation, useful for users rc.lua
+  # Example usage in rc.lua :
+  #
+  #   config = {}
+  #   config.dir = os.getenv("AWESOME_CONFIG_DIR")
+  #   beautiful.init(config.dir .. "/share/awesome//themes/zenburn/theme.lua")
+  #
   environment.variables.AWESOME_CONFIG_DIR = "${pkgs.awesome}";
   
   # Enable the X11 windowing system.