Markers are repeated, not mirrored

src/index.html

@@ -146,7 +146,7 @@ <h3><a class="anchor" id="marker-specification"></a>Markers</h3>
         </tbody>
       </table>
       <p>
-        Sixteen arena wall markers are positioned around the arena as shown in the <a href="#arena-specification">arena specification</a>. Marker codes are mirrored on each side of the arena.
+        Sixteen arena wall markers are positioned around the arena as shown in the <a href="#arena-specification">arena specification</a>. Marker codes are repeated on each side of the arena.
       </p>
       <p>
         Wall markers are placed such that the bottom of the marker is 20±5mm from the arena floor.