diff --git a/index.pug b/index.pug
index e7f280e..f6013e1 100644
--- a/index.pug
+++ b/index.pug
@@ -40,7 +40,11 @@ html(lang="en-gb")
             .page.game-data
                 h2 game data
 
-                input#game(type="file" autocomplete="off")
+                p.
+                    your game data is available from the #[i game data] window in bitsy,
+                    under the #[i tools] dropdown.
+
+                input#game(type="file" accept=".bitsy,.txt" autocomplete="off")
                 br
 
                 textarea#game-data(