diff --git a/examples/export-map.html b/examples/export-map.html
index ced0c13637..f3f620da59 100644
--- a/examples/export-map.html
+++ b/examples/export-map.html
@@ -3,7 +3,9 @@ layout: example.html
 title: Map Export
 shortdesc: Example of exporting a map as a PNG image.
 docs: >
-  Example of exporting a map as a PNG image.
+  Example of exporting a map as a PNG image. This example requires a browser
+  that supports <a href="https://developer.mozilla.org/de/docs/Web/API/HTMLCanvasElement/toBlob#Browser_compatibility">
+  <code>canvas.toBlob()</code></a>.
 tags: "export, png, openstreetmap"
 resources:
   - https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.3/FileSaver.min.js