diff --git a/notes.md b/notes.md
index 361e86c..cb50d6f 100644
--- a/notes.md
+++ b/notes.md
@@ -14,3 +14,4 @@
   * ~~implement parsing of [robots.txt](http://docs.w3cub.com/python~3.6/library/urllib.robotparser/)~~
   * investigate [gzip encoding](https://stackoverflow.com/questions/36383227/avoid-downloading-images-using-beautifulsoup-and-urllib-request)
   * implement some kind of progress display
+  * async
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