diff --git a/usage.html b/usage.html
index 49d4b61..59adebd 100644
--- a/usage.html
+++ b/usage.html
@@ -176,6 +176,16 @@
         Timeouts can exceed three by clicking them while holding the
         "Shift" key.
       </li>
+      <li>
+        You can leave off minutes or seconds if they're zero: "30:" is
+        the same as "30:00", and "19" is the same as "0:19".
+      </li>
+      <li>
+        If part of the scoreboard changes background color, click
+        (without shift) somewhere on the background to get it back to
+        normal.  It changed color because your browser was selecting
+        that part of the page for copy and paste!
+      </li>
     </ul>