diff --git a/examples/scale-line.html b/examples/scale-line.html
index 41ff9734e1..0e26f9c569 100644
--- a/examples/scale-line.html
+++ b/examples/scale-line.html
@@ -27,7 +27,9 @@
           <div id="map" class="map"></div>
           <select id="units">
             <option value="degrees">degrees</option>
-            <option value="imperial">imperial</option>
+            <option value="imperial">imperial inch</option>
+            <option value="us">us inch</option>
+            <option value="nautical">nautical mile</option>
             <option value="metric">metric</option>
           </select>
         </div>