diff --git a/notes.md b/notes.md
index 4b133db..9adf763 100644
--- a/notes.md
+++ b/notes.md
@@ -8,6 +8,7 @@
   * ~~ignore any links which aren't to pages~~
   * better url checking to get bare domain
   * remove trailing slash from any discovered url
+  * investigate lxml parser
   * ~~remove base url from initial urls with and without trailing slash~~
   * investigate using [tldextract](https://github.com/john-kurkowski/tldextract) to match urls
   * ~~implement parsing of [robots.txt](http://docs.w3cub.com/python~3.6/library/urllib.robotparser/)~~