diff --git a/README.md b/README.md
index b8ec149..1ce1e2c 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,8 @@ Tips
 
 - **"Pretty graphics" are disabled by default** to give new users a smoother experience.
 Tap the Effects button to see if you like it and it doesn't lag the browser too much.
-Settings are saved in the browser.
+- **Settings are saved in the browser.**
+- **There is a Undo button!** Look top left. It's dimmed when there's nothing to undo.
 - **You can copy the URL to share a particular board setup**
 
 Game rules