diff --git a/index.html b/index.html
index bbec85e4..17288dc6 100644
--- a/index.html
+++ b/index.html
@@ -3301,6 +3301,8 @@
             <option value="4">4x</option>
           </select>
         </div>
+
+        <div data-tip="Equirectangular projection is used: distortion is max on poles. Use map with aspect ratio 2:1 for best result" style="font-style: italic; margin: .2em 0">Equirectangular projection is used</div>
       </div>
 
       <div id="options3dBottom" style="margin-top: .2em">